[PATCH] D112190: [clang] Don't clear AST if we have consumers running after the main action

[Arthur Eubanks via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG2dcad7754a20: [clang] Don't clear AST if we have consumers running after the main action (authored by aeubanks).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D112190/new/

https://reviews.llvm.org/D112190

Files:
  clang/lib/Frontend/FrontendAction.cpp
  clang/test/Misc/clear-ast-before-backend-plugins.c


Index: clang/test/Misc/clear-ast-before-backend-plugins.c
===================================================================
--- /dev/null
+++ clang/test/Misc/clear-ast-before-backend-plugins.c
@@ -0,0 +1,9 @@
+// REQUIRES: plugins, examples, asserts
+
+// RUN: %clang_cc1 -mllvm -debug-only=codegenaction -clear-ast-before-backend -emit-obj -o /dev/null -load %llvmshlibdir/PrintFunctionNames%pluginext %s 2>&1 | FileCheck %s --check-prefix=YES
+// YES: Clearing AST
+
+// RUN: %clang_cc1 -mllvm -debug-only=codegenaction -clear-ast-before-backend -emit-obj -o /dev/null -load %llvmshlibdir/PrintFunctionNames%pluginext -add-plugin print-fns -plugin-arg-print-fns help %s 2>&1 | FileCheck %s --check-prefix=NO
+// NO-NOT: Clearing AST
+
+void f() {}
Index: clang/lib/Frontend/FrontendAction.cpp
===================================================================
--- clang/lib/Frontend/FrontendAction.cpp
+++ clang/lib/Frontend/FrontendAction.cpp
@@ -217,8 +217,13 @@
 
   // Add to Consumers the main consumer, then all the plugins that go after it
   Consumers.push_back(std::move(Consumer));
-  for (auto &C : AfterConsumers) {
-    Consumers.push_back(std::move(C));
+  if (!AfterConsumers.empty()) {
+    // If we have plugins after the main consumer, which may be the codegen
+    // action, they likely will need the ASTContext, so don't clear it in the
+    // codegen action.
+    CI.getCodeGenOpts().ClearASTBeforeBackend = false;
+    for (auto &C : AfterConsumers)
+      Consumers.push_back(std::move(C));
   }
 
   return std::make_unique<MultiplexConsumer>(std::move(Consumers));


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