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Add definition of enum storage type #209

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Add definition of enum storage type #209

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7 changes: 7 additions & 0 deletions riscv-elf.md
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Expand Up @@ -443,6 +443,13 @@ member. The size of any object is a multiple of its alignment.
Booleans (`bool`/`_Bool`) stored in memory or when being passed as scalar
arguments are either `0` (`false`) or `1` (`true`).

`enum` types use `int` as storage type if the value range fits into the value
range of `signed int` or into the value range of `unsigned int`. If the value
range is larger, the enum values use an 64bit integer storage type:

* `long` for an LP64 calling convention,
* `long long` for an ILP32 calling convention.
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This needs to actually specify the signedness of the types explicitly, not just that it uses an int's worth of space, as it affects things like C++ overloading. That is, it needs to be clearly:

  1. If it fits in an int, use int
  2. Else, if it fits in an unsigned int, use unsigned int
  3. Else, if it fits in a long (long), use long (long)
  4. Else use unsigned long (long)

(assuming that the long (long) case mirrors the int case in its choice of signedness)


A null pointer (for all types) has the value zero.

`_Float16` is as defined in the C ISO/IEC TS 18661-3 extension.
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