aeubanks updated this revision to Diff 411825. aeubanks added a comment. add header
Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D120666/new/ https://reviews.llvm.org/D120666 Files: clang/docs/ClangPlugins.rst Index: clang/docs/ClangPlugins.rst =================================================================== --- clang/docs/ClangPlugins.rst +++ clang/docs/ClangPlugins.rst @@ -200,3 +200,14 @@ PluginASTAction::ActionType getActionType() override { return AddAfterMainAction; } + +Interaction with ``-clear-ast-before-backend`` +---------------------------------------------- + +If the main AST action is codegen, having any plugins that run after the +codegen action automatically turns off ``-clear-ast-before-backend``, which +saves peak memory by clearing the Clang AST after generating IR and before +running IR optimizations. Use ``CmdlineBeforeMainAction`` or +``AddBeforeMainAction`` as ``getActionType`` to run plugins before the codegen +action and still have access to peak memory savings from +``-clear-ast-before-backend``.
Index: clang/docs/ClangPlugins.rst =================================================================== --- clang/docs/ClangPlugins.rst +++ clang/docs/ClangPlugins.rst @@ -200,3 +200,14 @@ PluginASTAction::ActionType getActionType() override { return AddAfterMainAction; } + +Interaction with ``-clear-ast-before-backend`` +---------------------------------------------- + +If the main AST action is codegen, having any plugins that run after the +codegen action automatically turns off ``-clear-ast-before-backend``, which +saves peak memory by clearing the Clang AST after generating IR and before +running IR optimizations. Use ``CmdlineBeforeMainAction`` or +``AddBeforeMainAction`` as ``getActionType`` to run plugins before the codegen +action and still have access to peak memory savings from +``-clear-ast-before-backend``.
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