[Reflection] Add lightweight error handling to ReflectionContext #82345
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Reflection metadata lookup failures are notoriously difficult to debug because there is no error handling in TypeLowering outside of compile-time #ifdef'd fprintf(stderr) calls. The nicest thing to do would be to adopt llvm::Expected<> but TypeLowering is also included in the standard library, which only has access to a tiny subset of the LLVM Support library. This patch adds a place to store a pointer to the first encountered error, which can then be converted to an llvm::Error at the API level. (cherry picked from commit 868c991)
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test with swiftlang/llvm-project#10868 |
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@swift-ci test macOS |
(cherry picked from commit 45198dc)
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@swift-ci test |
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test with swiftlang/llvm-project#10868 |
tbkka
approved these changes
Jun 27, 2025
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Reflection metadata lookup failures are notoriously difficult to debug because there is no error handling in TypeLowering outside of compile-time #ifdef'd fprintf(stderr) calls. The nicest thing to do would be to adopt llvm::Expected<> but TypeLowering is also included in the standard library, which only has access to a tiny subset of the LLVM Support library. This patch adds a place to store a pointer to the first encountered error, which can then be converted to an llvm::Error at the API level.
(cherry picked from commit 868c991)
Explanation: Better error handling for reflection in LLDB.
Scope: LLDB
Original PR: #82244
Risk: Low. NFC
Reviewers: @tbkka