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b79bd31356
This commit aims to simplify and de-duplicate the logic required for semantically analyzing `switch` expressions. The core logic has been moved to `analyzeSwitchBlock`, `resolveSwitchBlock` and `finishSwitchBlock` and has been rewritten around the new iterator-based API exposed by `Zir.UnwrappedSwitchBlock`. All validation logic and switch prong item resolution have been moved to `validateSwitchBlock`, which produces a `ValidatedSwitchBlock` containing all the necessary information for further analysis. `Zir.UnwrappedSwitchBlock`, `ValidatedSwitchBlock` and `SwitchOperand` replace `SwitchProngAnalysis` while adding more flexibility, mainly for better integration with `switch_block_err_union`. `analyzeSwitchBlock` has an explicit code path for OPV types which lowers them to either a `block`-`br` or a `loop`-`repeat` construct instead of a switch. Backends expect `switch` to actually have an operand that exists at runtime, so this is a bug fix and avoids further special cases in the rest of the switch logic. `resolveSwitchBlock` and `finishSwitchBr` exclusively deal with operands which can have more than one value, at comptime and at runtime respectively. This commit also reworks `RangeSet` to be an unmanaged container and adds `Air.SwitchBr.BranchHints` to offload some complexity from Sema to there and save a few bytes of memory in the process. Additionally, some new features have been implemented: - decl literals and everything else requiring a result type (`@enumFromInt`!) may now be used as switch prong items - union tag captures are now allowed for all prongs, not just `inline` ones - switch prongs may contain errors which are not in the error set being switched on, if these prongs contain `=> comptime unreachable` and some bugs have been fixed: - lots of issues with switching on OPV types are now fixed - the rules around unreachable `else` prongs when switching on errors now apply to *any* switch on an error, not just to `switch_block_err_union`, and are applied properly based on the AST - switching on `void` no longer requires an `else` prong unconditionally - lazy values are properly resolved before any comparisons with prong items - evaluation order between all kinds of switch statements is now the same, with or without label |
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| .. | ||
| Air | ||
| codegen | ||
| Compilation | ||
| libs | ||
| link | ||
| Package | ||
| Sema | ||
| Zcu | ||
| Air.zig | ||
| Builtin.zig | ||
| clang_options.zig | ||
| clang_options_data.zig | ||
| codegen.zig | ||
| Compilation.zig | ||
| crash_report.zig | ||
| dev.zig | ||
| fmt.zig | ||
| IncrementalDebugServer.zig | ||
| InternPool.zig | ||
| introspect.zig | ||
| link.zig | ||
| main.zig | ||
| mutable_value.zig | ||
| Package.zig | ||
| print_env.zig | ||
| print_targets.zig | ||
| print_value.zig | ||
| print_zir.zig | ||
| print_zoir.zig | ||
| RangeSet.zig | ||
| register_manager.zig | ||
| Sema.zig | ||
| target.zig | ||
| tracy.zig | ||
| Type.zig | ||
| Value.zig | ||
| Zcu.zig | ||
| zig_clang_cc1_main.cpp | ||
| zig_clang_cc1as_main.cpp | ||
| zig_clang_driver.cpp | ||
| zig_llvm-ar.cpp | ||
| zig_llvm.cpp | ||
| zig_llvm.h | ||