[lldb] Add Swift exception breakpoint frame recognizer #11097
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A follow up to this is to implement |
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Depends on llvm#152201 |
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Fixes a bug that surfaces in frame recognizers. Details about the bug: A new frame recognizer is configured to match a specific symbol (`swift_willThrow`). This is an `extern "C"` symbol defined in a C++ source file. When Swift is built with debug info, the function `ParseFunctionFromDWARF` will use the debug info to construct a function name that looks like a C++ declaration (`::swift_willThrow(void *, SwiftError**)`). The `Mangled` instance will have this string as its `m_demangled` field, and have _no_ string for its `m_mangled` field. The result is the frame recognizer would not match the symbol to the name (`swift_willThrow` != `::swift_willThrow(void *, SwiftError**)`. By changing `ParseFunctionFromDWARF` to assign both a demangled name and a mangled, frame recognizers can successfully match symbols in this configuration. (cherry picked from commit 2959051)
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Adds a frame recognizer for Swift breakpoint exceptions (
break set -E swift).This initial version does the following:
Selecting the frame where the throw occurs allows more direct inspection of the context that is throwing, and avoids displaying Swift's internal callback hook, which isa frame with no source and no variables – only disassembly.
rdar://156452605