[all-commits] [llvm/llvm-project] 0b23d9: Reduce memory usage in AST parent map generation b...

[higher-performance via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 0b23d98dceaa9f965bfa196a6adfa38b1b8bda8e
      https://github.com/llvm/llvm-project/commit/0b23d98dceaa9f965bfa196a6adfa38b1b8bda8e
  Author: higher-performance <higher.performance.github at gmail.com>
  Date:   2025-03-17 (Mon, 17 Mar 2025)

  Changed paths:
    M clang/lib/AST/ParentMapContext.cpp

  Log Message:
  -----------
  Reduce memory usage in AST parent map generation by lazily checking if nodes have been seen (#129934)

This mitigates a regression introduced in #87824.

The mitigation here is to store pointers the deduplicated AST nodes, rather than copies of the nodes themselves. This allows a pointer-optimized set to be used and saves a lot of memory because `clang::DynTypedNode` is ~5 times larger than a pointer.

Fixes #129808.

(cherry picked from commit 8c7f0eaa6ee3f84e3d8260535cced234bed4fa28)



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