This following summarizes the most important changes in recent Spicy releases. For an exhaustive list of all changes, see the :repo:`CHANGES` file coming with the distribution. Version 1.13 (in progress) ========================== .. rubric:: New Functionality .. rubric:: Changed Functionality .. rubric:: Bug fixes .. rubric:: Documentation Version 1.12 ============ .. rubric:: New Functionality - We now support ``if`` around a block of unit items: .. code-block:: spicy type X = unit { x: uint8; if ( self.x == 1 ) { a1: bytes &size=2; a2: bytes &size=2; }; }; One can also add an ``else``-block: .. code-block:: spicy type X = unit { x: uint8; if ( self.x == 1 ) { a1: bytes &size=2; a2: bytes &size=2; } else { b1: bytes &size=2; b2: bytes &size=2; }; }; - We now support attaching an ``%error`` handler to an individual field: .. code-block:: spicy type Test = unit { a: b"A"; b: b"B" %error { print "field B %error", self; } c: b"C"; }; With input ``AxC``, that handler will trigger, whereas with ``ABx`` it won't. If the unit had a unit-wide ``%error`` handler as well, that one would trigger in both cases (i.e., for ``b``, in addition to its field local handler). The handler can also be provided separately from the field: .. code-block:: spicy on b %error { ... } In that separate version, one can receive the error message as well by declaring a corresponding string parameter: .. code-block:: spicy on b(msg: string) %error { ... } This works externally, from outside the unit, as well: .. code-block:: spicy on Test::b(msg: string) %error { ... } - GH-1856: We added support for specifying a dedicated error message for ``requires`` failures. This now allows creating custom error messages when a ``&require`` condition fails. Example: .. code-block:: spicy type Foo = unit { x: uint8 &requires=($$ == 1 : error"Deep trouble!'"); # or, shorter: y: uint8 &requires=($$ == 1 : "Deep trouble!'"); }; This is powered by a new condition test expression ``COND : ERROR``. - We reworked C++ code generation so now many parsers should compile faster. This is accomplished by both improved dependency tracking when emitting C++ code for a module as well as by a couple of new peephole optimization passes which additionally reduced the emitted code. .. rubric:: Changed Functionality - Add ``CMAKE_CXX_FLAGS`` to ``HILTI_CONFIG_RUNTIME_LD_FLAGS``. - Speed up compilation of many parsers by streamlining generated C++ code. - Add ``starts_with``, ``split``, ``split1``, ``lower`` and ``upper`` methods to ``string``. - GH-1874: Add new library function ``spicy::bytes_to_mac``. - Optimize ``spicy::bytes_to_hexstring`` and ``spicy::bytes_to_mac``. - Improve validation of attributes so incompatible or invalid attributes should be rejected more reliably. - Optimize parsing for ``bytes`` of fixed size as well as literals. - Add a couple of peephole optimizations to reduce emitted C++ code. - GH-1790: Provide proper error message when trying access an unknown unit field. - GH-1792: Prioritize error message reporting unknown field. - GH-1803: Fix namespacing of ``hilti`` IDs in Spicy-side diagnostic output. - GH-1895: Do no longer escape backslashes when printing strings or bytes. - GH-1857: Support ``&requires`` for individual vector items. - GH-1859: Improve error message when a unit parameter is used as a field. - GH-1898: Disallow attributes on "type aliases". - GH-1938: Deprecate ``&count`` attribute. - GH-1928: Deprecate ``&anchor`` with regular expression constructors. - GH-1935: Allow defining parser alias names when running spicy-driver. .. rubric:: Bug fixes - GH-1815: Disallow expanding limited ``View``'s again with ``limit``. - Fix ``to_uint(ByteOrder)`` for empty byte ranges. - Fix undefined shifts of 32bit integer in ``toInt()``. - GH-1817: Prevent null ptr dereference when looking on nodes without ``Scope``. - Fix use of move'd from variable. - GH-1823: Don't qualify magic linker symbols with C++ namespace. - Fix diagnostics seen when compiling with GCC. - GH-1852: Fix ``skip`` with units. - GH-1832: Fail for vectors with bytes but no stop. - GH-1860: Fix parsing for vectors of literals. - GH-1847: Fix resynchronization issue with trimmed input. - GH-1844: Fix nested look-ahead parsing. - GH-1842: Fix when input redirection becomes visible. - GH-1846: Fix bug with captures groups. - GH-1875: Fix potential nullptr dereference when comparing streams. - GH-1867: Fix infinite loops with recursive types. - GH-1868: Associate source code locations with current fiber instead of current thread. - GH-1871: Fix ``&max-size`` on unit containing a ``switch``. - GH-1791: Fix usage of ``&convert`` with unit's requiring parameters. - GH-1858: Fix the literals parsers not following coercions. - GH-1893: Encompass child node's location in parent. - GH-1919: Validate that sets are sortable. - GH-1918: Fix potential segfault with stream iterators. - GH-1856: Disallow dereferencing a ``result`` value. - Fix issue with type inference for ``result`` constructor. - GH-1933: Fix ``HILTI_CXX_FLAGS`` for when multiple flags are passed. - GH-1829: Catch integer shifts exceeding the width of the operand. .. rubric:: Documentation - Redo error handling docs - Document ``continue`` statements. - GH-1063: Document arguments to ``new`` operator. - Updates ``.to_int()``/``.to_uint()`` documentation. - GH-1914: Make ``$$`` documentation more precise. - Fix doc code snippet that won't compile. Version 1.11 ============ .. rubric:: New Functionality - GH-3779: Add ``%sync_advance`` hook. This adds support for a new unit hook: .. code-block:: spicy on %sync_advance(offset: uint64) { ... } This hook is called regularly during error recovery when synchronization skips over data or gaps while searching for a valid synchronization point. It can be used to check in on the synchronization to, e.g., abort further processing if it just keeps failing. ``offset`` is the current position inside the input stream that synchronization just skipped to. By default, "called regularly" means that it's called every 4KB of input skipped over while searching for a synchronization point. That value can be changed by setting a unit property ``%sync-advance-block-size = ``. As an additional minor tweak, this also changes the name of what used to be the ``__gap__`` profiler to now be called ``__sync_advance`` because it's profiling the time spent in skipping data, not just gaps. - Add unit method ``stream()`` to access current input stream, and stream method ``statistics()`` to retrieve input statistics. This returns a struct of the following type, reflecting the input seen so far: .. code-block:: spicy type StreamStatistics = struct { num_data_bytes: uint64; ## number of data bytes processed num_data_chunks: uint64; ## number of data chunks processed, excluding empty chunks num_gap_bytes: uint64; ## number of gap bytes processed num_gap_chunks: uint64; ## number of gap chunks processed, excluding empty chunks }; - GH-1750: Add ``to_real`` method to ``bytes``. This interprets the data as representing an ASCII-encoded floating point number and converts that into a ``real``. The data can be in either decimal or hexadecimal format. If it cannot be parsed as either, throws an ``InvalidValue`` exception. - GH-1608: Add ``get_optional`` method to maps. This returns an ``optional`` value either containing the map's element for the given key if that entry exists, or an unset ``optional`` if it does not. - GH-90/GH-1733: Add ``result`` and ``spicy::Error`` types to Spicy to facilitate error handling. .. rubric:: Changed Functionality - The Spicy compiler has become a bit more strict and is now rejecting some ill-defined code constructs that previous versions ended up letting through. Specifically, the following cases will need updating in existing code: - Identifiers from the (internal) ``hilti::`` namespace are no longer accessible. Usually you can just scope them with ``spicy::`` instead. - Previous versions did not always enforce constness as it should have. In particular, function parameters could end up being mutable even when they weren't declared as ``inout``. Now ``inout`` is required for supporting any mutable operations on a parameter, so make sure to add it where needed. - When using unit parameters, the type of any ``inout`` parameters now must be unit itself. To pass other types into a unit so that they can be modified by the unit, use reference instead of ``inout``. For example, use ``type Foo = unit(s: sink&)`` instead of ``type Foo = unit(inout: sink)``. See https://docs.zeek.org/projects/spicy/en/latest/programming/parsing.html#unit-parameters for more. - The Spicy compiler new uses a more streamlined storage and access scheme to represent source code. This speeds up work up util C++ source translation (e.g., faster time to first error message during development). - ``spicyc`` options ``-c`` and ``-l`` no longer support compiling multiple Spicy source files to C++ code individually to then build them all together. This was a rarely used feature and actually already broken in some situations. Instead, use ``spicyc -x`` to produce the C++ code for all needed Spicy source files at once. ``-c`` and ``-l`` remain available for debugging purposes. - The ``spicyc`` option ``-P`` now requires a prefix argument that sets the C++ namespace, just like ``-x `` does. This is so that the prototypes match the actual code generated by ``-x``. To get the same identifiers as before, use an empty prefix (``-P ""``). - GH-1763: Restrict initialization of ``const`` values to literals. This means that e.g., ``const`` values cannot be initialized from other ``const`` values or function calls anymore. - ``result`` and ``network`` are now keywords and cannot be used anymore as user-specified indentifiers. - GH-1661: Deprecate usage of ``&convert`` with ``&chunked``. - GH-1657: Reduce data copying when passing data to the driver. - GH-1501: Improve some error messages for runtime parse errors. - GH-1655: Reject joint usage of filters and look-ahead. - GH-1675: Extend runtime profiling to measure parser input volume. - GH-1624: Enable optimizations when running ``spicy-build``. .. rubric:: Bug fixes - GH-1759: Fix ``if``-condition with ``switch`` parsing. - Fix Spicy's support for ``network`` type. - GH-1598: Enforce that the argument ``new`` is either a type or a ctor. - GH-1742, GH-1760: Unroll constructors of big containers in generated code. We previously would generate code which would be expensive to compiler for some compilers. We now generate more friendly code. - GH-1745: Fix C++ initialization of global constants through global functions. - GH-1743: Use a checked cast for ``map``'s ``in`` operator. - GH-1664: Fix ``&convert`` typing issue with bit ranges. - GH-1724: Fix skipping in size-constrained units. We previously could skip too much data if ``skip`` was used in a unit with a global ``&size``. - Fix incremental skipping. We previously would incorrectly compute the amount of data to skip which could have potentially lead to the parser consuming more data than available. - GH-1586: Make skip productions behave like the production they are wrapping. - GH-1711: Fix forwarding of a reference unit parameter to a non-reference parameter. - GH-1599: Fix integer increment/decrement operators require mutable arguments. - GH-1493: Support/fix public type aliases to units. .. rubric:: Documentation - Add new section with guidelines and best practices. This focuses on performance for now, but may be extended with other areas alter. Much of the content was contributed by Corelight Labs. - Fix documented type mapping for integers. - Document generic operators. Version 1.10 ============ .. rubric:: New Functionality .. rubric:: Changed Functionality - Numerous improvements to improve throughput of generated parsers. For this release we have revisited the code typically generated for parsers and the runtime libraries they use with the goal of improving throughput of parsers at runtime. Coarsely summarized this work was centered around - reduction of allocations during parsing - reduction of data copies during parsing - use of dedicated, hand-check implementations for automatically generated code to avoid overhead from safety checks in the runtime libraries With these changes we see throughput improvements of some parsers in the range of 20-30%. This work consisted of numerous incremental changes, see ``CHANGES`` for the full list of changes. - GH-1667: Always advance input before attempting resynchronization. When we enter resynchronization after hitting a parse error we previously would have left the input alone, even though we know it fails to parse. We then relied fully on resynchronization to advance the input. With this patch we always forcibly advance the input to the next non-gap position. This has no effect for synchronization on literals, but allows it to happen earlier for regular expressions. - GH-1659: Lift requirement that ``bytes`` forwarded from filter be mutable. - GH-1489: Deprecate &bit-order on bit ranges. This had no effect and allowing it may be confusing to users. Deprecate it with the idea of eventual removal. - Extend location printing to include single-line ranges. For a location of, e.g., "line 1, column 5 to 10", we now print ``1:5-1:10``, whereas we used to print it as only ``1:5``, hence dropping information. - GH-1500: Add ``+=`` operator for ``string``. This allows appending to a ``string`` without having to allocate a new string. This might perform better most of the time. - GH-1640: Implement skipping for any field with known size. This patch adds ``skip`` support for fields with ``&size`` attribute or of builtin type with known size. If a unit has a known size and it is specified in a ``&size`` attribute this also allows to skip over unit fields. .. rubric:: Bug fixes - GH-1605: Allow for unresolved types for set ``in`` operator. - GH-1617: Fix handling of ``%synchronize-*`` attributes for units in lists. We previously would not detect ``%synchronize-at`` or ``%synchronize-from`` attributes if the unit was not directly in a field, i.e., we mishandled the common case of synchronizing on a unit in a list. We now handle these attributes, regardless of how the unit appears. - GH-1585: Put closing of unit sinks behind feature guard. This code gets emitted, regardless of whether a sink was actually connected or not. Put it behind a feature guard so it does not enable the feature on its own. - GH-1652: Fix filters consuming too much data. We would previously assume that a filter would consume all available data. This only holds if the filter is attached to a top-level unit, but in general not if some sub-unit uses a filter. With this patch we explicitly compute how much data is consumed. - GH-1668: Fix incorrect data consumption for ``&max-size``. We would previously handle ``&size`` and ``&max-size`` almost identical with the only difference that ``&max-size`` sets up a slightly larger view to accommodate a sentinel. In particular, we also used identical code to set up the position where parsing should resume after such a field. This was incorrect as it is in general impossible to tell where parsing continues after a field with ``&max-size`` since it does not signify a fixed view like ``&size``. We now compute the next position for a ``&max-size`` field by inspecting the limited view to detect how much data was extracted. - GH-1522: Drop overzealous validator. A validator was intended to reject a pattern of incorrect parsing of vectors, but instead ending up rejecting all vector parsing if the vector elements itself produced vectors. We dropped this validation. - GH-1632: Fix regex processing using ``{n,m}`` repeat syntax being off by one - GH-1648: Provide meaningful unit ``__begin`` value when parsing starts. We previously would not provide ``__begin`` when starting the initial parse. This meant that e.g., ``offset()`` was not usable if nothing ever got parsed. We now provide a meaningful value. - Fix skipping of literal fields with condition. - GH-1645: Fix ``&size`` check. The current parsing offset could legitimately end up just beyond the ``&size`` amount. - GH-1634: Fix infinite loop in regular expression parsing. .. rubric:: Documentation - Update documentation of ``offset()``. - Fix docs namespace for symbols from ``filter`` module. We previously would document these symbols to be in ``spicy`` even though they are in ``filter``. - Add bitfield examples. Version 1.9 =========== .. rubric:: New Functionality - GH-1468: Allow to directly access members of anonymous bitfields. We now automatically map fields of anonymous bitfields into their containing unit. .. code-block:: spicy type Foo = unit { : bitfield(8) { x: 0..3; y: 4..7; }; on %done { print self.x, self.y; } }; - GH-1467: Support bitfield constants in Spicy for parsing. One can now define bitfield "constants" for parsing by providing integer expressions with fields: .. code-block:: spicy type Foo = unit { x: bitfield(8) { a: 0..3 = 2; b: 4..7; c: 7 = 1; }; This will first parse the bitfield as usual and then enforce that the two bit ranges that are coming with expressions (i.e., ``a`` and ``c``) indeed containing the expected values. If they don't, that's a parse error. We also support using such bitfield constants for look-ahead parsing: .. code-block:: spicy type Foo = unit { x: uint8[]; y: bitfield(8) { a: 0..3 = 4; b: 4..7; }; }; This will parse uint8s until a value is discovered that has its bits set as defined by the bitfield constant. (We use the term "constant" loosely here: only the bits with values are actually enforced to be constant, all others are parsed as usual.) - GH-1089, GH-1421: Make ``offset()`` independent of random access functionality. We now store the value returned by ``offset()`` directly in the unit instead of computing it on the fly when requested from ``cur - begin``. With that ``offset()`` can be used without enabling random access functionality on the unit. - Add support for passing arbitrary C++ compiler flags. This adds a magic environment variable ``HILTI_CXX_FLAGS`` which if set specifies compiler flags which should be passed during C++ compilation after implicit flags. This could be used to e.g., set defines, or set low-level compiler flags. Even with this flag, for passing include directories one should still use ``HILTI_CXX_INCLUDE_DIRS`` since they are searched before any implicitly added paths. - GH-1435: Add bitwise operators ``&``, ``|``, and ``^`` for booleans. - GH-1465: Support skipping explicit ``%done`` in external hooks. Assuming ``Foo::X`` is a unit type, these two are now equivalent: .. code-block:: spicy on Foo::X::%done { } on Foo::X { } .. rubric:: Changed Functionality - GH-1567: Speed up runtime calls to start profilers. - GH-1565: Disable capturing backtraces with HILTI exceptions in non-debug builds. - GH-1343: Include condition in ``&requires`` failure message. - GH-1466: Reject uses of ``self`` in unit ``&size`` and ``&max-size`` attribute. Values in ``self`` are only available after parsing has started while ``&size`` and ``&max-size`` are consumed before that. This means that any use of ``self`` and its members in these contexts would only ever see unset members, so it should not be the intended use. - GH-1485: Add validator rejecting unsupported multiple uses of attributes. - GH-1465: Produce better error message when hooks are used on a unit field. - GH-1503: Handle anonymous bitfields inside ``switch`` statements. We now map items of anonymous bitfields inside a ``switch`` cases into the unit namespace, just like we already do for top-level fields. We also catch if two anonymous bitfields inside those cases carry the same name, which would make accesses ambiguous. So the following works now: .. code-block:: spicy switch (self.n) { 0 -> : bitfield(8) { A: 0..7; }; * -> : bitfield(8) { B: 0..7; }; }; Whereas this does not work: .. code-block:: spicy switch (self.n) { 0 -> : bitfield(8) { A: 0..7; }; * -> : bitfield(8) { A: 0..7; }; }; - GH-1571: Remove trimming inside individual chunks. Trimming a ``Chunk`` (always from the left) causes a lot of internal work with only limited benefit since we manage visibility with a ``stream::View`` on top of a ``Chunk`` anyway. We now trimming only removes a ``Chunk`` from a ``Chain``, but does not internally change individual the ``Chunk`` anymore. This should benefit performance but might lead to slightly increased memory use, but callers usually have that data in memory anyway. - Use ``find_package(Python)`` with version. Zeek's configure sets ``Python_EXECUTABLE`` has hint, but Spicy is using ``find_package(Python3)`` and would only use ``Python3_EXECUTABLE`` as hint. This results in Spicy finding a different (the default) Python executable when configuring Zeek with ``--with-python=/opt/custom/bin/python3``. Switch Spicy over to use ``find_package(Python)`` and add the minimum version so it knows to look for ``Python3``. .. rubric:: Bug fixes - GH-1520: Fix handling of ``spicy-dump --enable-print``. - Fix spicy-build to correctly infer library directory. - GH-1446: Initialize generated struct members in constructor body. - GH-1464: Add special handling for potential ``advance`` failure in trial mode. - GH-1275: Add missing lowering of Spicy unit ctor to HILTI struct ctor. - Fix rendering in validation of ``%byte-order`` attribute. - GH-1384: Fix stringification of ``DecodeErrorStrategy``. - Fix handling of ``--show-backtraces`` flag. - GH-1032: Allow using using bitfields with type declarations. - GH-1484: Fix using of ``&convert`` on bitfields. - GH-1508: Fix returned value for ``.position()``. - GH-1504: Use user-inaccessible chars for encoding ``::`` in feature variables. - GH-1550: Replace recursive deletion with explicit loop to avoid stack overflow. - GH-1549: Add feature guards to accesses of a unit's ``__position``. .. rubric:: Documentation - Move Zeek-specific documentation into Zeek documentation. - Clarify error handling docs. - Mention unit switch statements in conditional parsing docs. Version 1.8 =========== .. rubric:: New Functionality - Add new ``skip`` keyword to let unit items efficiently skip over uninteresting data. For cases where your parser just needs to skip over some data, without needing access to its content, Spicy provides a ``skip`` keyword to prefix corresponding fields with: .. spicy-code:: skip.spicy module Test; public type Foo = unit { x: int8; : skip bytes &size=5; y: int8; on %done { print self; } }; ``skip`` works for all kinds of fields but is particularly efficient with ``bytes`` fields, for which it will generate optimized code avoiding the overhead of storing any data. ``skip`` fields may have conditions and hooks attached, like any other fields. However, they do not support ``$$`` in expressions and hooks. For readability, a ``skip`` field may be named (e.g., ``padding: skip bytes &size=3;``), but even with a name, its value cannot be accessed. ``skip`` fields extend support for ``void`` with attributes fields which are now deprecated. - Add runtime profiling infrastructure. This add an option ``--enable-profiling`` to the HILTI and Spicy compilers. Use of the option does two things: (1) it sets a flag enabling inserting additional profiling instrumentation into generated C++ code, and (2) it enables using instrumentation for recording profiling information during execution of the compiled code, including dumping out a profiling report at the end. The profiling information collected includes time spent in HILTI functions as well as for parsing Spicy units and unit fields. .. rubric:: Changed Functionality - Optimizations for improved runtime performance. This release contains a number of changes to improve the runtime performance of generated parsers. This includes tweaks for generating more performant code for parsers, low-level optimizations of types in to runtime support library as well as fine-tuning of parser execution at runtime. - Do not force locale on users of libhilti. - Avoid expensive checked iterator for internal ``Bytes`` iteration. - GH-1089: Allow to use ``offset()`` without enabling full random-access support. - GH-1394: Fix C++ normalization of generated enum values. - Disallow using ``$$`` with anonymous containers. .. rubric:: Bug fixes - GH-1386: Prevent internal error when passed invalid context. - Fix potential use-after-move bug. - GH-1390: Initialize ``Bytes`` internal control block for all constructors. - GH-1396: Fix regex performance regression introduced by constant folding. - GH-1399: Guard access to unit ``_filters`` member with feature flag. - GH-1421: Store numerical offset in units instead of iterator for position. - GH-1436: Make sure ``Bytes::sub`` only throws HILTI exceptions. - GH-1447: Do not forcibly make ``strong_ref`` ``in`` function parameters immutable. - GH-1452: Allow resolving of unit parameters before ``self`` is fully resolved. - Make sure Spicy runtime config is initialized after ``spicy::rt::init``. - Adjustments for building with GCC-13. .. rubric:: Documentation - Document how to check whether an ``optional`` value is set. - Preserve indention when extracting comments in doc generation. - Fix docs for long-form of ``-x`` flag to spicyc. Version 1.7 =========== .. rubric:: New Functionality - Support Zeek-style documentation strings in Spicy source code. - Provide ability for host applications to initiate runtime's module-pre-init phase manually. - Add DPD-style ``spicy::accept_input()`` and ``spicy::decline_input()``. - Add driver option to output full set of generated C++ files. - GH-1123: Support arbitrary expression as argument to type constructors, such as ``interval(...)``. .. rubric:: Changed Functionality - Search ``HILTI_CXX_INCLUDE_DIRS`` paths before default include paths. - Search user module paths before system paths. - Streamline runtime exception hierarchy. - Fix bug in cast from ``real`` to ``interval``. - GH-1326: Generate proper runtime types for enums. - GH-1330: Reject uses of imported module IDs as expression. .. rubric:: Bug fixes - GH-1310: Fix ASAN false positive with GCC. - GH-1345: Improve runtime performance of stream iteration. - GH-1367: Use unique filename for all object files generated during JIT. - Remove potential race during JIT when using ``HILTI_CXX_COMPILER_LAUNCHER``. - GH-1349: Fix incremental regexp matching for potentially empty results. .. rubric:: Documentation Version 1.6 =========== .. rubric:: New Functionality - GH-1249: Allow combining ``&eod`` with ``&until`` or ``&until-including``. - GH-1251: When decoding bytes into a string using a given character set, allow caller to control error handling. All methods taking a charset parameters now take an additional enum selecting 1 of 3 possible error handling strategies in case a character can't be decoded/represented: ``STRICT`` throws an error, ``IGNORE`` skips the problematic character and proceeds with the next, and ``REPLACE`` replaces the problematic character with a safe substitute. ``REPLACE`` is the default everywhere now, so that by default no errors are triggered. This comes with an additional functional change for the ASCII encoding: we now consistently sanitize characters that ASCII can't represent when in ``REPLACE``/``IGNORE`` modes (and, hence, by default), and trigger errors in ``STRICT`` mode. Previously, we'd sometimes let them through, and never triggered any errors. This also fixes a bug with the ASCII encoding sometimes turning a non-printable character into multiple repeated substitutes. - GH-1294: Add library function to parse an address from string or bytes. - HLTO files now perform a version check when loaded. We previously would potentially allow building a HLTO file against one version of the Spicy runtime, and then load it with a different version. If exposed symbols matched loading might have succeeded, but could still have lead to sublte bugs at runtime. We now embed a runtime version string in HLTO files and reject loading HLTO files into a different runtime version. We require an exact version match. - New ``pack`` and ``unpack`` operators. These provide low-level primitives for transforming a value into, or out of, a binary representations, see :ref:`the docs ` for details. .. rubric:: Changed Functionality - GH-1236: Add support for adding link dependencies via ``--cxx-link``. - GH-1285: C++ identifiers referenced in ``&cxxname`` are now automatically interpreted to be in the global namespace. - Synchronization-related debug messages are now logged to the ``spicy-verbose`` stream. We added logging of successful synchronization. - Downgrade required Flex version. We previously required at least flex-2.6.0; we can now build against flex-2.5.37. - Improve C++ caching during JIT. We improved caching behavior via ``HILTI_CXX_COMPILER_LAUNCHER`` if the configuration of ``spicyc`` was changed without changing the C++ file produced during JIT. - ``hilti::rt::isDebugVersion`` has been removed. - The ``-O | --optimize`` flag has been removed from command line tools. This was already a no-op without observable side-effects. - GH-1311: Reject use of ``context()`` unit method if unit does not declare a context with ``%context``. - GH-1319: Unsupported unit variable attributes are now rejected. - GH-1299: Add validator for bitfield field ranges. - We now reject uses of ``self`` as an ID. - GH-1233: Reject key types for maps that can't be sorted. - Fix validator for field ``&default`` expression types for constness. When checking types of field ``&default`` expressions we previously would also consider their constness. This breaks e.g., cases where the used expression is not a LHS like the field the ``&default`` is defined for, .. code-block:: ruby type X = unit { var x: bytes = b"" + a; }; We now do not consider constness in the type check anymore. Since fields are never const this allows us to set a ``&default`` with constant expressions as well. .. rubric:: Bug fixes - GH-1231: Add special handling for potential ``advance`` failure in trial mode. - GH-1115, GH-1196: Explicitly type temporary value used by ``&max_size`` logic. - GH-1143, GH-1220: Add coercion on assignment for optionals that only differ in constness of their inner types. - GH-1230: Add coercion to default argument of ``map::get``. - GH-1234, GH-1238: Fix assertions with anonymous struct constructor. - GH-1248: Fix ``stop`` for unbounded loop. - GH-1250: Fix internal errors when seeing unsupported character classes in regular expression. - GH-1170: Fix contexts not allowing being passed ``inout``. - GH-1266: Fix wrong type for Spicy-side ``self`` expression. - GH-1261: Fix inability to access unit fields through ``self`` in ``&convert`` expressions. - GH-1267: Install only needed headers from bundled SafeInt library. - GH-1227: Fix code generation when a module's file could be imported through different means. - GH-1273: Remove bundled code licensed under `CPOL license `_. - GH-1303: Fix potentially late synchronization when jumping over gaps during synchronization. - Do not force gold linker with user-provided linker flags or when built as a CMake subproject. - Improve efficiency of ``startsWith`` for long inputs. .. rubric:: Documentation - The documentation now reflects Zeek package manager Spicy feature templates. - The documentation for bitfields was clarified. - Documentation for casts from integers to boolean was added. - We added documentation for how to expose custom C++ code in Spicy. - Update doc link to commits mailing list. - Clarify that ``%context`` can only be used in top-level units. - Clarify that ``&until`` consumes the delimiter. - GH-1240: Clarify docs on ``SPICY_VERSION``. - Add FAQ item on source locations. - Add example for use of ``?.``. Version 1.5 =========== .. rubric:: New Functionality - GH-1179: Cap parallelism use for JIT background jobs. During JIT, we would previously launch all compilation jobs in parallel. For projects using many modules this could have lead to resource contention which often forced users to use sequential compilation with ``HILTI_JIT_SEQUENTIAL``. We now by default cap the number of parallel background jobs at the number of logical cores. This can be parameterized with the environment variable ``HILTI_JIT_PARALLELISM`` which for ``HILTI_JIT_PARALLELISM=1`` reproduces ``HILTI_JIT_SEQUENTIAL``. - GH-1134: Add support for ``synchronize-at`` and ``synchronize-after`` properties. These unit properties allow specifying a literal which should be searched for during error recovery. If the respective unit is used as a synchronize point during error recovery, i.e., it is used as a field which is marked ``&synchronize``, input resynchronization during error recovery will seek to the next position of this pattern in the input stream. - GH-1209: Provide error message to ``%error`` handler. We now allow to optionally provide a string parameter with ``%error`` that will receive the associated error message: .. code-block:: spicy on %error(msg: string) { print msg; } .. rubric:: Changed Functionality - GH-1184: Allow more cache hits if only a few modules are changed in multi-module compilation. - GH-1208: Incremental performance tweaks for JIT. - GH-1197: Make handling of sanitizer workarounds more granular. .. rubric:: Bug fixes - GH-1150: Preserve additional permissions from umask when generating HLTO files. - GH-1154: Add stringificaton of ``Map::value_type``. - GH-1080: Reject constant declarations at non-global scope. - GH-1164: Make compiler plugin initialization explicit. - GH-1050: Update location when entering most parser methods. - GH-1187: Fix support for having multiple source modules of the same name. - GH-1197: Prevent too early integer overflow in pow. - GH-1201: Adjust removal of symlinks on install for ``DESTDIR``. - GH-1203: Allow changing ``DESTDIR`` between configure and install time. - GH-1204: Remove potential use-after-move. - GH-1210: Prevent unnecessarily executable stack with GNU toolchain. - GH-1206: Fix detection of recursive dependencies. - GH-1217: Produce ``hilti::rt::Bool`` when casting to boolean. - GH-1224: Fix import segfault. .. rubric:: Documentation - GH-44: Update docs for spicy-plugin rename ``_Zeek::Spicy`` -> ``Zeek::Spicy``. - GH-1183: Update docs for Discourse migration. - GH-1205: Update Spicy docs for now being built into Zeek. Version 1.4 =========== .. rubric:: New Functionality - Add support for recovery from parse errors or incomplete input This release adds support for recovering from parse errors or incomplete input (e.g., gaps or partial connections). Grammars can denote unit synchronization points with a ``&synchronize`` attribute. If an error is encountered while extracting a previous fields, parsing will attempt to resynchronize the input at that point. The synchronization result needs to be checked and confirmed or rejected explicitly; a number of hooks are provided for that. See :ref:`the docs ` for details. - Remove restriction that units used as sinks need to be ``public`` - Uses ``ccache`` for C++ compilation during JIT if Spicy itself was configured to use ``ccache`` Spicy spends a considerable amount of JIT time compiling generated C++ code. This work can be cached if neither inputs nor any of the used flags have changed so that subsequent JIT runs can complete much faster. We now automatically cache many C++ compilation artifacts with ``ccache`` if Spicy itself was configured with e.g., ``--with-hilti-compiler-launcher=ccache``. This behavior can be controlled or disabled via the ``HILTI_CXX_COMPILER_LAUNCHER`` environment variable. - GH-842: Add Spicy support for struct initialization. - GH-1036: Support unit initialization through a struct constructor expression. .. rubric:: Changed Functionality - GH-1074: ``%random-access`` is now derived automatically from uses and declaring it explicitly has been deprecated. - GH-1072: Disallow enum declarations with non-unique values. It is unclear what code should be generated when requested to convert an integer value to the following enum: .. code-block:: spicy type E = enum { A = 1, B = 2, C = 1, }; For ``1`` we could produce either ``E::A`` or ``E::C`` here. Instead of allowing this ambiguity we now disallow enums with non-unique values. .. rubric:: Bug fixes - Prevent exception if cache directory is not readable. - Propagate failure from ``cmake`` up to ``./configure``. - GH-1030: Make sure types required for globals are declared before being used. - Fix potentially use-after-free in stringification of ``stream::View``. - GH-1087: Make ``offset`` return correct value even before parsing of field. .. rubric:: Documentation Version 1.3 =========== .. rubric:: New Functionality - Add optimizer removing unused ``%random-access`` or ``%filter`` functionality If a unit has e.g., a ``%random-access`` attribute Spicy emits additional code to track and update offsets. If the ``%random-access`` functionality is not used this leads to unneeded code being emitted which causes unneeded overhead, both during JIT and during execution. We now emit such feature-dependent code under a feature flag (effectively a global boolean constant) which is by default *on*. Additionally, we added an optimizer pass which detects whether a feature is used and can disable unused feature functionality (switching the feature flag to *off*), and can then remove unreachable code behind such disabled feature flags by performing basic constant folding. - Add optimizer pass removing unused sink functionality By default any unit declared ``public`` can be used as a sink. To support sink behavior additional code is emitted and invoked at runtime, regardless of whether the unit is used as a sink or not. We now detect unused sink functionality and avoid emitting it. - GH-934: Allow ``$$`` in place of ``self`` in unit convert attributes. .. rubric:: Changed Functionality - GH-941: Allow use of units with all defaulted parameters as entry points. - We added precompilation support for ``libspicy.h``. - Drop support for end-of-life Fedora 32, and add support for Fedora 34. .. rubric:: Bug fixes - Correctly handle lookups for NULL library symbols. - Use safe integers for ``size`` functions in the runtime library. - Make it possible to build on ARM64. - Fix building with gcc-11. .. rubric:: Documentation Version 1.2 =========== .. rubric:: New Functionality - GH-913: Add support for switch-level ``&parse-at`` and ``&parse-from`` attributes inside a unit. - Add optimizer pass removing unimplemented functions and methods. This introduces a global pass triggered after all individual input ASTs have been finalized, but before we generate any C++ code. We then strip out any unimplemented member functions (typically Spicy hooks), both their definitions as well as their uses. In order to correctly handle previously generated C++ files which might have been generated with different optimization settings, we disallow optimizations if we detect that a C++ input file was generated by us. .. rubric:: Changed Functionality - Add validation of unit switch attributes. We previously silently ignored unsupported attributes; now errors are raised. - Remove configure option ``--build-zeek-plugin``. Spicy no longer supports building the Zeek plugin/analyzers in-tree. This used to be available primarily for development purposes, but became challenging to maintain. - Add environment variable ``HILTI_CXX_INCLUDE_DIRS`` to specify additional C++ include directories when compiling generated code. - GH-940: Add runtime check for parsing progress during loops. .. rubric:: Bug fixes - Fix computation of unset locations. - Fix accidental truncating conversion in integer code. .. rubric:: Documentation Version 1.1 =========== .. rubric:: New Functionality - GH-844: Add support for ``&size`` attribute to unit ``switch`` statement. - GH-26: Add ``%skip``, ``%skip-pre`` and ``%skip-post`` properties for skipping input matching a regular expression before any further input processing takes place. - Extend library functionality provided by the ``spicy`` module: - ``crc32_init()/crc32_add()`` compute CRC32 checksums. - ``mktime()`` creates a ``time`` value from individual components. - ``zlib_init()`` initializes a ``ZlibStream`` with a given window bits argument. - ``Zlib`` now accepts a window bits parameter. - Add a new ``find()`` method to units for that searches for a ``bytes`` sequence inside their input data, forward or backward from a given starting position. - Add support for ``&chunked`` when parsing bytes data with ``&until`` or ``&until_including``. - Add ``encode()`` method to ``string`` for conversion to ``bytes``. - Extend parsing of ``void`` fields: - Add support for ``&eod`` to skip all data until the end of the current input is encountered. - Add support for ``&until`` to skip all data until a deliminator is encountered. The deliminator will be extracted from the stream before continuing. - Port Spicy to Apple silicon. - Add Dockerfile for OpenSUSE 15.2. .. rubric:: Changed Functionality - Reject ``void`` fields with names. - Lower minimum required Python version to 3.2. - GH-882: Lower minimum required Bison version to 3.0. .. rubric:: Bug fixes - GH-872: Fix missing normalization of enum label IDs. - GH-878: Fix casting integers to enums. - GH-889: Fix hook handling for anonymous void fields. - GH-901: Fix type resolution bug in ``&convert``. - Fix handling of ``&size`` attribute for anonymous void fields. - Fix missing update to input position before running ``%done`` hook. - Add validation rejecting ``$$`` in hooks not supporting it. - Make sure container sizes are runtime integers. - Fix missing operator<< for enums when generating debug code. - GH-917: Default-initialize forwarding fields without type arguments. - GH-1774: Fix synchronization with symbol different from last lookahead token. - GH-1777: Fix interning of regexps for ``%skip*``. .. rubric:: Documentation - GH-37: Add documentation on how to skip data with ``void`` fields.