Orlando Cazalet-Hyams 43a9d5dfd5 [KeyInstr] Add Atom Group waterline to LLVMContext (#133478) ...

Source location atoms are identified by a function-local number and the
DILocation's InlinedAt field. The front end is responsible for assigning source
atom numbers, but certain optimisations need to assign new atom numbers to some
instructions. Most often code duplication optimisations like loop
unroll. Tracking a global maximum value (waterline) means we can easily
(cheaply) get new numbers that don't clash in any function.

The waterline is managed through DILocation creation,
LLVMContext::incNextAtomGroup, and LLVMContext::updateAtomGroupWaterline.

Add unittest.

RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668

2025-05-06 11:42:50 +01:00

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