Add the ability for a native host to load an assembly and specify the load context

[elinor-fung]

The hosting APIs provide a way to get a delegate for runtime functionality. There is a delegate for loading an assembly in an isolated context and getting a function pointer(hdt_load_assembly_and_get_function_pointer) and one for just getting a function pointer (hdt_get_function_pointer), but there is no way to simply load an assembly.

get_function_pointer takes in a void* load_context (which currently must be null, indicating the default ALC). We should add an equivalent for just loading an assembly (for example, load_assembly) with a void* load_context.

The most immediate concern is getting into the default ALC, so we could start with limiting the implementation to that case (like we currently do in get_function_pointer).

Related:

• COMHost/ComActivator without separate AssemblyLoadContext #66013
• Question: Avoid IsolatedComponentLoadContext ALC AaronRobinsonMSFT/DNNE#115
• Clarification about hdt_load_in_memory_assembly #77375

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Issue Details

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The hosting APIs provide a way to get a delegate for runtime functionality. There is a delegate for loading an assembly in an isolated context and getting a function pointer(hdt_load_assembly_and_get_function_pointer) and one for just getting a function pointer (hdt_get_function_pointer), but there is no way to simply load an assembly.

get_function_pointer takes in a void* load_context (which currently must be null, indicating the default ALC). We should add an equivalent for just loading an assembly (for example, load_assembly) with a void* load_context.

Author:	elinor-fung
Assignees:	-
Labels:	area-Host
Milestone:	8.0.0