[AutoDiff] Add generated implicit declarations to SynthesizedFileUnit. #30863
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`SourceFile::addVisibleDecl` is an unnecessary API. It was upstreamed in swiftlang#30821.
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dan-zheng
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@slavapestov: I started this change based on your feedback: #30845 (comment).
Could you please review? I left comments about potential changes to SynthesizedFileUnit.
lib/AST/Module.cpp
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Note: consider robust discriminator ideas for synthesized files?
SynthesizedFileUnit does not store any contents (e.g. name) useful for discrimination. Perhaps we could use file index (the nth synthesized file in the module), though I'm not sure that file order is robust.
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Currently, ADContext in the differentiation transform is responsible for creating a SynthesizedFileUnit.
Instead, we could add utilities for creating a SynthesizedFileUnit on ModuleDecl:
Optional<SynthesizedFileUnit *> ModuleDecl::getSynthesizedFileUnitSynthesizedFileUnit *ModuleDecl::getOrCreateSynthesizedFileUnit
SynthesizedFileUnit is a new construct, so we could establish invariants like "each module only has one synthesized file unit". I don't know about benefits of these invariants if SynthesizedFileUnit is used only by the differentiation transform.
lib/AST/Module.cpp
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Note: SourceFile and ModuleDecl use SourceLookupCache to store declarations, which enables more efficient lookup. But I didn't use SourceLookupCache for SynthesizedFileUnit because that involves publicly exposing a mutating SourceLookupCache::addTopLevelDecl function.
TopLevelDecls is a SmallVector instead of a DenseMap, copying the old DerivedFileUnit. DenseMap makes lookup more efficient, but I think it makes SynthesizedFileUnit::getTopLevelDecls less efficient.
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`SynthesizedFileUnit` is a container for synthesized declarations. Currently, it only supports module-level declarations. It is used by the SIL differentiation transform, which generates implicit struct and enum declarations.
Add implicit declarations generated by the differentiation transform to a `SynthesizedFileUnit` instead of an ad-hoc pre-existing `SourceFile`. Resolves TF-1232: type reconstruction for AutoDiff-generated declarations. Previously, type reconstruction failed because retroactively adding declarations to a `SourceFile` did not update name lookup caches.
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Make `ADContext` lazily create a `SynthesizedFileUnit` instead of creating one during `ADContext` construction. This avoids always creating a `SynthesizedFileUnit` in every module, since differentiation is a mandatory transform that always runs. It was nonetheless useful to test always creating a `SynthesizedFileUnit` for testing purposes.
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Merging to unblock progress. Happy to address any feedback later!
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Friend PR: swiftlang/swift#30863 (cherry picked from commit 33154ab)
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Add
SynthesizedFileUnit: a container for synthesized declarations. Currently, it only supports module-level declarations.Use
SynthesizedFileUnitin the differentiation transform: add implicit generated declarations generated to aSynthesizedFileUnitinstead of an ad-hoc pre-existingSourceFile.Resolves TF-1232: type reconstruction for AutoDiff-generated declarations.
Previously, type reconstruction failed because retroactively adding declarations to a
SourceFiledid not update name lookup caches.Unblocks end-to-end differentiation transform testing.