[CHERIoT]: Add cheriot_sealing_type clang built-in
#167
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I am a bit confused by this. This builtin needs to take an identifier not a type. The same type can be used for two kinds of sealed value. |
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This PR introduces a new
__builtin_cheriot_sealing_typebuilt-in command in clang, that should replace theCHERIOT_EMIT_STATIC_SEALING_TYPEmacro, as referenced in #6. Its syntax resembles that of a call to a C++ template function:Of course, it can be used in plain C as well, with the same syntax.
The side effects of this call is that two new entries,
and
are generated, respectively in the
.compartment_importsand.compartment_exportssections. The value of the import is a sequence of two words, the address of the export and0; the value of the export reproduces the value generated in the original macro.