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v0.4: Polish and refactoring
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@MikePopoloski MikePopoloski released this 16 Aug 13:09
· 2674 commits to master since this release
v0.4
4f4c3b9

Highlights

This release contains a lot of internal refactoring and cleanup, with the goals of correctly handling all corner cases as well as dramatically speeding up compilation time -- some projects and workloads may see up to a 10x speedup.

Language Support

  • Support for intra-assignment timing controls
  • Full support for dynamic arrays in type checking and constant expressions
  • Full support for associative arrays in type checking and constant expressions
  • Partial support for queues in type checking and constant expressions (still missing expressions involving the '$' magic value)
  • Added $dimensions and $unpacked_dimensions system functions
  • Added $printtimescale, $timeformat, and $system functions
  • Added $ferror, $fgets, $fscanf, $sscanf, and $fread system functions
  • Support for disable statements
  • Support for unpacked array concatenations
  • Support for min:typ:max expressions
  • Support for disable-fork and wait-fork statements
  • String literals can now correctly be implicitly assigned to unpacked arrays of bytes (thanks to @thingkingland )

General Features

  • Reworked how definitions and instances are represented, both to make the code clearer as well as to allow caching of identical instances.
  • Timing controls are now included in AST->JSON serialization (thanks to @Kuree ).
  • Added initial support for generating simulation code for designs using LLVM. There's enough support here to simulate a basic "Hello World" example but not much else.
  • To facilitate code generation, a mid-level IR representation was added to sit between the AST and LLVM. In the future this could grow to be useful to other consumers as well.
  • Went through and removed experimental code analysis services from the repository and ported the CI build to GitHub actions, fixing the automated release and deployment pipeline in the process.
  • Split slang into several component libraries to make it easier to link in only subsets of functionality.
  • Added a bunch more API reference documentation.
  • The remaining 3rd party dependencies have been vendored into the repo under the external/ folder. The conan package manager has been removed from the build process.

Fixes

  • Fixed a bug where stringifying certain integer literals could produce garbage results.
  • Improved parser error recovery in more scenarios.
  • Fixed several crashes found by fuzz testing.
  • Empty concatenations now correctly report an error.
  • Fixed a faulty error reported when range-selecting a single bit from a big-endian vector.
  • Fixed the type that is inferred for implicitly typed parameters.
  • Rewrote lvalue handling in constant expressions to fix several corner cases.
  • Fixed a crash in the preprocessor involving a rare case of macro replacing a token that then becomes another macro.
  • Fixed parsing of cycle delays.
  • Fixed ANSI color output on Windows terminals.
  • Fixed variable lifetimes of task arguments.
  • Packed dimensions on enum declarations were previously being ignored.
  • Added additional error checking for various array creation rules.
  • Fixed an infinite loop in the parser caused by unsupported statements (thanks to @thingkingland ).
  • Fixed a bunch of issues with parsing new expressions.
  • Fixed a bunch of issues with parsing clocking blocks.
  • The error reported for non-standard character escape codes has been downgraded to a warning.
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