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In #188242, we replaced `PointerUnion`'s `PointerIntPair` storage with `PunnedPointer<void*>`. The old formatters relied on the PIP synthetic provider (LLDB) / `get_pointer_int_pair helper` (GDB) which no longer work. Instead, read raw bytes from `PunnedPointer` and compute the active tag from template argument type alignments -- the same fixed-width encoding the C++ implementation uses. When template arg enumeration is truncated (e.g., function-local types in GDB), the formatters fall back to showing a tag-stripped `void*` instead of silently misdecoding. Alternatives that didn't work out: - Adding a C++ helper (`getActiveMemberIdx`) callable from Python: gets optimized out even with `__attribute__((used, noinline))`, and expression evaluation fails for synthetic children. - Using `isa`/`dyn_cast` checks from Python: requires expression evaluation, which does not work for local types or synthetic children without a frame context. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The LLVM Compiler Infrastructure
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
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