release/19.x: [C++20] [Modules] Fix the duplicated static initializer problem (#114193) #114197
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@llvm/pr-subscribers-clang-codegen @llvm/pr-subscribers-clang-modules Author: None (llvmbot) ChangesBackport 259eaa6 Requested by: @ChuanqiXu9 Full diff: https://github.com/llvm/llvm-project/pull/114197.diff 2 Files Affected:
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 151505baf38db1..2a5d5f9083ae65 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -7080,8 +7080,8 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
// For C++ standard modules we are done - we will call the module
// initializer for imported modules, and that will likewise call those for
// any imports it has.
- if (CXX20ModuleInits && Import->getImportedOwningModule() &&
- !Import->getImportedOwningModule()->isModuleMapModule())
+ if (CXX20ModuleInits && Import->getImportedModule() &&
+ Import->getImportedModule()->isNamedModule())
break;
// For clang C++ module map modules the initializers for sub-modules are
diff --git a/clang/test/Modules/static-initializer.cppm b/clang/test/Modules/static-initializer.cppm
new file mode 100644
index 00000000000000..10d4854ee67fa6
--- /dev/null
+++ b/clang/test/Modules/static-initializer.cppm
@@ -0,0 +1,18 @@
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+// RUN: split-file %s %t
+//
+// RUN: %clang_cc1 -triple %itanium_abi_triple -std=c++20 %t/a.cppm -emit-module-interface -o %t/a.pcm
+// RUN: %clang_cc1 -triple %itanium_abi_triple -std=c++20 %t/a.cpp -fmodule-file=a=%t/a.pcm -emit-llvm -o - | FileCheck %t/a.cpp
+
+//--- a.cppm
+export module a;
+int func();
+static int a = func();
+
+//--- a.cpp
+import a;
+
+// CHECK-NOT: internal global
+// CHECK-NOT: __cxx_global_var_init
+
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@ChuanqiXu9 is this one ready to be merged? |
Yes, I believe this is ready to be merged. |
…#114193) Reproducer: ``` //--- a.cppm export module a; int func(); static int a = func(); //--- a.cpp import a; ``` The `func()` should only execute once. However, before this patch we will somehow import `static int a` from a.cppm incorrectly and initialize that again. This is super bad and can introduce serious runtime behaviors. And also surprisingly, it looks like the root cause of the problem is simply some oversight choosing APIs. (cherry picked from commit 259eaa6)
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@ChuanqiXu9 (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport 259eaa6
Requested by: @ChuanqiXu9