b40d36c90b
A simple enum is an enum which has an automatic integer tag type, all tag values automatically assigned, and no top level declarations. Such enums are created directly in AstGen and shared by all the generic/comptime instantiations of the surrounding ZIR code. This commit implements, but does not yet add any test cases for, simple enums. A full enum is an enum for which any of the above conditions are not true. Full enums are created in Sema, and therefore will create a unique type per generic/comptime instantiation. This commit does not implement full enums. However the `enum_decl_nonexhaustive` ZIR instruction is added and the respective Type functions are filled out. This commit makes an improvement to ZIR code, removing the decls array and removing the decl_map from AstGen. Instead, decl_ref and decl_val ZIR instructions index into the `owner_decl.dependencies` ArrayHashMap. We already need this dependencies array for incremental compilation purposes, and so repurposing it to also use it for ZIR decl indexes makes for efficient memory usage. Similarly, this commit fixes up incorrect memory management by removing the `const` ZIR instruction. The two places it was used stored memory in the AstGen arena, which may get freed after Sema. Now it properly sets up a new anonymous Decl for error sets and uses a normal decl_val instruction. The other usage of `const` ZIR instruction was float literals. These are now changed to use `float` ZIR instruction when the value fits inside `zir.Inst.Data` and `float128` otherwise. AstGen + Sema: implement int_to_enum and enum_to_int. No tests yet; I expect to have to make some fixes before they will pass tests. Will do that in the branch before merging. AstGen: fix struct astgen incorrectly counting decls as fields. Type/Value: give up on trying to exhaustively list every tag all the time. This makes the file more manageable. Also found a bug with i128/u128 this way, since the name of the function was more obvious when looking at the tag values. Type: implement abiAlignment and abiSize for structs. This will need to get more sophisticated at some point, but for now it is progress. Value: add new `enum_field_index` tag. Value: add hash_u32, needed when using ArrayHashMap.
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