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Jon Ross-Perkins c1a894fca7 Start adding ImportRefUsed, removing older copy behavior. (#3657 )

Builds on #3656.

Under the prior "lazy" model, we had been planning to copy instructions.
Under the current "unused+used" model, we're restricting that to
constants. I'm trimming back some of the ResolveIfImportRefUnused logic
because it was more appropriate for the former model.

Right now, I'm adding ImportRefUsed direct creation in import.cpp for
namespaces. I think I'll need to do something similar in
RseolveIfImportRefUnused... I'm still trying to think about how to
manage type information there (which needs to come in as an import
reference itself, and probably have some amount of deduplication before
forming a TypeId). So ImportRefUnused lacks a type because I'm hesitant
to aggressively load it, whereas ImportRefUsed should *always* have a
type but it's just an error while I think things through.

For reference, ImportRefUnused and ImportRefUsed are mainly split in
order to track the boolean "used" without making fundamental
modifications to Inst for bit packing (this effectively instead packs a
bit into InstKind). AnyImportRef currently excludes the type because
it's mainly for diagnostic printing at the moment. It could end up with
a TypeId that would end up Invalid for ImportRefUnused, though it could
also be that the TypeId is only accessed when using ImportRefUsed
explicitly.

2024-01-26 17:26:15 +00:00

base

Change lexical lookup to use an array instead of hash map. (#3582 )

2024-01-10 23:06:37 +00:00

check

Start adding ImportRefUsed, removing older copy behavior. (#3657 )

2024-01-26 17:26:15 +00:00

codegen

Move llvm::Initialize* calls to main. (#3449 )

2023-12-07 01:45:47 +00:00

diagnostics

Produce a more descriptive error if an array type's bound is too large. (#3638 )