Revert "Only add targetFallback if target is not in defined in current product"

This was an accidental addition of a non-reviewed change.

This reverts commit f63db9159bbbb0db98e13cb4440fdaa5c40e219

Revert "Only add targetFallback if target is not in defined in current product"

This was an accidental addition of a non-reviewed change.

This reverts commit f63db9159bbbb0db98e13cb4440fdaa5c40e219b.

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Only add targetFallback if target is not in defined in current product

[clang][ExtractAPI] Record availability information on all platforms

Currently ExtractAPI only emits availability information for the
current platform. This makes it easy for clients to get all avai

[clang][ExtractAPI] Record availability information on all platforms

Currently ExtractAPI only emits availability information for the
current platform. This makes it easy for clients to get all availability
information for a given symbol in one invocation as opposed to having to invoke
clang once per-platform and then merge the symbol-graphs.

Differential Revision: https://reviews.llvm.org/D130918

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[clang][extract-api] Add support for true anonymous enums

Anonymous enums without a typedef should have a "(anonymous)" identifier.

Differential Revision: https://reviews.llvm.org/D123533

[clang][extract-api] Emit "functionSignature" in SGF for ObjC methods.

- Split GlobalRecord into two distinct types to be able to introduce
has_function_signature type trait.
- Add has_function_sign

[clang][extract-api] Emit "functionSignature" in SGF for ObjC methods.

- Split GlobalRecord into two distinct types to be able to introduce
has_function_signature type trait.
- Add has_function_signature type trait.
- Serialize function signatures as part of serializeAPIRecord for
records that are known to have a function signature.

Differential Revision: https://reviews.llvm.org/D123304

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[clang][extract-api] Add Objective-C Category support

Add (partial) support for Objective-C category records in ExtractAPI.
The current ExtractAPI collects everything for an Objective-C category,
bu

[clang][extract-api] Add Objective-C Category support

Add (partial) support for Objective-C category records in ExtractAPI.
The current ExtractAPI collects everything for an Objective-C category,
but not fully serialized in the SymbolGraphSerializer. Categories
extending external interfaces are disgarded during serialization, and
categories extending known interfaces are merged (all members surfaced)
into the interfaces.

Differential Revision: https://reviews.llvm.org/D122774

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[clang][extract-api] Add support for typedefs

Typedef records consist of the symbol associated with the underlying
TypedefDecl and a SymbolReference to the underlying type. Additionally
typedefs for

[clang][extract-api] Add support for typedefs

Typedef records consist of the symbol associated with the underlying
TypedefDecl and a SymbolReference to the underlying type. Additionally
typedefs for anonymous TagTypes use the typedef'd name as the symbol
name in their respective records and USRs. As a result the declaration
fragments for the anonymous TagType are those for the associated
typedef. This means that when the user is defining a typedef to a
typedef to a anonymous type, we use a reference the anonymous TagType
itself and do not emit the typedef to the anonymous type in the
generated symbol graph, including in the type destination of further
typedef symbol records.

Differential Revision: https://reviews.llvm.org/D123019

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[clang][extract-api] Add support for macros

To achieve this we hook into the preprocessor during the
ExtractAPIAction and record definitions for macros that don't get
undefined during preprocessing.

[clang][extract-api] Add Objective-C protocol support

Add support for Objective-C protocol declarations in ExtractAPI.

Depends on D122446

Differential Revision: https://reviews.llvm.org/D122511

[clang][extract-api] Add Objective-C interface support

Add support for Objective-C interface declarations in ExtractAPI.

Depends on D122495

Differential Revision: https://reviews.llvm.org/D122446

[NFC][clang][extract-api] Add missing virtual anchors

Add missing virtual method anchors for structs in ExtractAPI/API.h

[clang][extract-api] Stop allocating APIRecords via BumpPtrAllocator

Using a BumpPtrAllocator introduced memory leaks for APIRecords as they
contain a std::vector. This meant that we needed to alway

[clang][extract-api] Stop allocating APIRecords via BumpPtrAllocator

Using a BumpPtrAllocator introduced memory leaks for APIRecords as they
contain a std::vector. This meant that we needed to always keep a
reference to the records in APISet and arrange for their destructor to
get called appropriately. This was further complicated by the need for
records to own sub-records as these subrecords would still need to be
allocated via the BumpPtrAllocator and the owning record would now need
to arrange for the destructor of its subrecords to be called
appropriately.

Since APIRecords contain a std::vector so whenever elements get added to
that there is an associated heap allocation regardless. Since
performance isn't currently our main priority it makes sense to use
regular unique_ptr to keep track of APIRecords, this way we don't need
to arrange for destructors to get called.

The BumpPtrAllocator is still used for strings such as USRs so that we
can easily de-duplicate them as necessary.

Differential Revision: https://reviews.llvm.org/D122331

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[clang][extract-api] Add struct support

- Add `StructFieldRecord` and `StructRecord` to store API information
for structs
- Implement `VisitRecordDecl` in `ExtractAPIVisitor`
- Implement Symbol Gr

[clang][extract-api] Add struct support

- Add `StructFieldRecord` and `StructRecord` to store API information
for structs
- Implement `VisitRecordDecl` in `ExtractAPIVisitor`
- Implement Symbol Graph serialization for struct records.
- Add test case for struct records.

Depends on D121873

Differential Revision: https://reviews.llvm.org/D122202

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[clang][extract-api] Add enum support

Add support for enum records
- Add `EnumConstantRecord` and `EnumRecord` to store API information for
enums
- Implement `VisitEnumDecl` in `ExtractAPIVisitor`

[clang][extract-api] Add enum support

Add support for enum records
- Add `EnumConstantRecord` and `EnumRecord` to store API information for
enums
- Implement `VisitEnumDecl` in `ExtractAPIVisitor`
- Implement serializatin for enum records and `MemberOf` relationship
- Add test case for enum records
- Few other improvements

Depends on D122160

Differential Revision: https://reviews.llvm.org/D121873

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[clang][extract-api] Refactor ExtractAPI and improve docs

- The name SymbolGraph is inappropriate and confusing for the new library
for clang-extract-api. Refactor and rename things to make it cle

[clang][extract-api] Refactor ExtractAPI and improve docs

- The name SymbolGraph is inappropriate and confusing for the new library
for clang-extract-api. Refactor and rename things to make it clear that
ExtractAPI is the core functionality and SymbolGraph is one serializer
for the API information.
- Add documentation comments to ExtractAPI classes and methods to improve
readability and clearness of the ExtractAPI work.

Differential Revision: https://reviews.llvm.org/D122160

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