[llvm-branch-commits] [clang] release/20.x: [clang-repl] Fix destructor for interpreter for the cuda negation case (#138091) (PR #138680)

[via llvm-branch-commits]

https://github.com/llvmbot created https://github.com/llvm/llvm-project/pull/138680

Backport 529b6fcb00aabbed17365e5fb3abbc2ae127c967

Requested by: @anutosh491

>From f2e38873737ef4f5bd51b4a9b3ef1c5b33ae7d27 Mon Sep 17 00:00:00 2001
From: Anutosh Bhat <andersonbhat491 at gmail.com>
Date: Mon, 5 May 2025 13:32:33 +0530
Subject: [PATCH] [clang-repl] Fix destructor for interpreter for the cuda
 negation case (#138091)

Check this error for more context
(https://github.com/compiler-research/CppInterOp/actions/runs/14749797085/job/41407625681?pr=491#step:10:531)

This fails with
```
* thread #1, name = 'CppInterOpTests', stop reason = signal SIGSEGV: address not mapped to object (fault address: 0x55500356d6d3)
  * frame #0: 0x00007fffee41cfe3 libclangCppInterOp.so.21.0gitclang::PragmaNamespace::~PragmaNamespace() + 99
    frame #1: 0x00007fffee435666 libclangCppInterOp.so.21.0gitclang::Preprocessor::~Preprocessor() + 3830
    frame #2: 0x00007fffee20917a libclangCppInterOp.so.21.0gitstd::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() + 58
    frame #3: 0x00007fffee224796 libclangCppInterOp.so.21.0gitclang::CompilerInstance::~CompilerInstance() + 838
    frame #4: 0x00007fffee22494d libclangCppInterOp.so.21.0gitclang::CompilerInstance::~CompilerInstance() + 13
    frame #5: 0x00007fffed95ec62 libclangCppInterOp.so.21.0gitclang::IncrementalCUDADeviceParser::~IncrementalCUDADeviceParser() + 98
    frame #6: 0x00007fffed9551b6 libclangCppInterOp.so.21.0gitclang::Interpreter::~Interpreter() + 102
    frame #7: 0x00007fffed95598d libclangCppInterOp.so.21.0gitclang::Interpreter::~Interpreter() + 13
    frame #8: 0x00007fffed9181e7 libclangCppInterOp.so.21.0gitcompat::createClangInterpreter(std::vector<char const*, std::allocator<char const*>>&) + 2919
```

Problem :

1) The destructor currently handles no clearance for the DeviceParser
and the DeviceAct. We currently only have this

https://github.com/llvm/llvm-project/blob/976493822443c52a71ed3c67aaca9a555b20c55d/clang/lib/Interpreter/Interpreter.cpp#L416-L419

2) The ownership for DeviceCI currently is present in
IncrementalCudaDeviceParser. But this should be similar to how the
combination for hostCI, hostAction and hostParser are managed by the
Interpreter. As on master the DeviceAct and DeviceParser are managed by
the Interpreter but not DeviceCI. This is problematic because :
IncrementalParser holds a Sema& which points into the DeviceCI. On
master, DeviceCI is destroyed before the base class ~IncrementalParser()
runs, causing Parser::reset() to access a dangling Sema (and as Sema
holds a reference to Preprocessor which owns PragmaNamespace) we see
this
```
  * frame #0: 0x00007fffee41cfe3 libclangCppInterOp.so.21.0gitclang::PragmaNamespace::~PragmaNamespace() + 99
    frame #1: 0x00007fffee435666 libclangCppInterOp.so.21.0gitclang::Preprocessor::~Preprocessor() + 3830

```

(cherry picked from commit 529b6fcb00aabbed17365e5fb3abbc2ae127c967)
---
 clang/include/clang/Interpreter/Interpreter.h | 3 +++
 clang/lib/Interpreter/DeviceOffload.cpp       | 8 +++-----
 clang/lib/Interpreter/DeviceOffload.h         | 4 +---
 clang/lib/Interpreter/Interpreter.cpp         | 9 ++++++++-
 4 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/clang/include/clang/Interpreter/Interpreter.h b/clang/include/clang/Interpreter/Interpreter.h
index 56213f88b9e30..f8663e3193a18 100644
--- a/clang/include/clang/Interpreter/Interpreter.h
+++ b/clang/include/clang/Interpreter/Interpreter.h
@@ -116,6 +116,9 @@ class Interpreter {
   /// Compiler instance performing the incremental compilation.
   std::unique_ptr<CompilerInstance> CI;
 
+  /// An optional compiler instance for CUDA offloading
+  std::unique_ptr<CompilerInstance> DeviceCI;
+
 protected:
   // Derived classes can use an extended interface of the Interpreter.
   Interpreter(std::unique_ptr<CompilerInstance> Instance, llvm::Error &Err,
diff --git a/clang/lib/Interpreter/DeviceOffload.cpp b/clang/lib/Interpreter/DeviceOffload.cpp
index 7d0125403ea52..05625ddedb72f 100644
--- a/clang/lib/Interpreter/DeviceOffload.cpp
+++ b/clang/lib/Interpreter/DeviceOffload.cpp
@@ -25,13 +25,12 @@
 namespace clang {
 
 IncrementalCUDADeviceParser::IncrementalCUDADeviceParser(
-    std::unique_ptr<CompilerInstance> DeviceInstance,
-    CompilerInstance &HostInstance,
+    CompilerInstance &DeviceInstance, CompilerInstance &HostInstance,
     llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> FS,
     llvm::Error &Err, const std::list<PartialTranslationUnit> &PTUs)
-    : IncrementalParser(*DeviceInstance, Err), PTUs(PTUs), VFS(FS),
+    : IncrementalParser(DeviceInstance, Err), PTUs(PTUs), VFS(FS),
       CodeGenOpts(HostInstance.getCodeGenOpts()),
-      TargetOpts(DeviceInstance->getTargetOpts()) {
+      TargetOpts(DeviceInstance.getTargetOpts()) {
   if (Err)
     return;
   StringRef Arch = TargetOpts.CPU;
@@ -41,7 +40,6 @@ IncrementalCUDADeviceParser::IncrementalCUDADeviceParser(
                                                llvm::inconvertibleErrorCode()));
     return;
   }
-  DeviceCI = std::move(DeviceInstance);
 }
 
 llvm::Expected<llvm::StringRef> IncrementalCUDADeviceParser::GeneratePTX() {
diff --git a/clang/lib/Interpreter/DeviceOffload.h b/clang/lib/Interpreter/DeviceOffload.h
index 43645033c4840..0b903e31c6799 100644
--- a/clang/lib/Interpreter/DeviceOffload.h
+++ b/clang/lib/Interpreter/DeviceOffload.h
@@ -28,8 +28,7 @@ class IncrementalCUDADeviceParser : public IncrementalParser {
 
 public:
   IncrementalCUDADeviceParser(
-      std::unique_ptr<CompilerInstance> DeviceInstance,
-      CompilerInstance &HostInstance,
+      CompilerInstance &DeviceInstance, CompilerInstance &HostInstance,
       llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> VFS,
       llvm::Error &Err, const std::list<PartialTranslationUnit> &PTUs);
 
@@ -42,7 +41,6 @@ class IncrementalCUDADeviceParser : public IncrementalParser {
   ~IncrementalCUDADeviceParser();
 
 protected:
-  std::unique_ptr<CompilerInstance> DeviceCI;
   int SMVersion;
   llvm::SmallString<1024> PTXCode;
   llvm::SmallVector<char, 1024> FatbinContent;
diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index f91563dd0378c..3b81f9d701b42 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -416,6 +416,10 @@ Interpreter::Interpreter(std::unique_ptr<CompilerInstance> Instance,
 Interpreter::~Interpreter() {
   IncrParser.reset();
   Act->FinalizeAction();
+  if (DeviceParser)
+    DeviceParser.reset();
+  if (DeviceAct)
+    DeviceAct->FinalizeAction();
   if (IncrExecutor) {
     if (llvm::Error Err = IncrExecutor->cleanUp())
       llvm::report_fatal_error(
@@ -501,8 +505,11 @@ Interpreter::createWithCUDA(std::unique_ptr<CompilerInstance> CI,
 
   DCI->ExecuteAction(*Interp->DeviceAct);
 
+  Interp->DeviceCI = std::move(DCI);
+
   auto DeviceParser = std::make_unique<IncrementalCUDADeviceParser>(
-      std::move(DCI), *Interp->getCompilerInstance(), IMVFS, Err, Interp->PTUs);
+      *Interp->DeviceCI, *Interp->getCompilerInstance(), IMVFS, Err,
+      Interp->PTUs);
 
   if (Err)
     return std::move(Err);