patch change

Author: kr-2003

.github/workflows/main.yml

@@ -317,14 +317,14 @@ jobs:
       with:
         cache-hit: ${{ steps.cache.outputs.cache-hit }}
 
-    - name: Cache LLVM-${{ matrix.clang-runtime }} and ${{ matrix.cling == 'On' && 'Cling' || 'Clang-REPL' }} build
-      uses: actions/cache/save@v4
-      if: ${{ steps.cache.outputs.cache-hit != 'true' }}
-      with:
-        path: |
-          llvm-project
-          ${{ matrix.cling=='On' && 'cling' || '' }}
-        key: ${{ steps.cache.outputs.cache-primary-key }}
+    # - name: Cache LLVM-${{ matrix.clang-runtime }} and ${{ matrix.cling == 'On' && 'Cling' || 'Clang-REPL' }} build
+    #   uses: actions/cache/save@v4
+    #   if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+    #   with:
+    #     path: |
+    #       llvm-project
+    #       ${{ matrix.cling=='On' && 'cling' || '' }}
+    #     key: ${{ steps.cache.outputs.cache-primary-key }}
 
     - name: Setup code coverage
       if: ${{ success() && (matrix.coverage == true) }}

lib/CppInterOp/CppInterOpInterpreter.h

@@ -43,6 +43,7 @@
 #ifndef _WIN32
 #include <unistd.h>
 #endif
+#include <algorithm>
 #include <cstdio>
 #include <utility>
 #include <vector>

patches/llvm/clang20-1-out-of-process.patch

@@ -72,7 +72,12 @@ index 000000000..825143f00
 +
 +/// Get the PID of the last launched executor.
 +/// This is useful for debugging or for cleanup purposes.
++/// Returns PID of last launched executor.
 +pid_t getLastLaunchedExecutorPID();
++
++/// Returns PID of nth launched executor.
++/// 1-based indexing.
++pid_t getNthLaunchedExecutorPID(int n);
 +#endif // LLVM_CLANG_INTERPRETER_REMOTEJITUTILS_H
 diff --git a/clang/lib/Interpreter/CMakeLists.txt b/clang/lib/Interpreter/CMakeLists.txt
 index bf70cdfbe..38cf139fa 100644
@@ -199,7 +204,7 @@ index 000000000..8324aeaaf
 +using namespace llvm;
 +using namespace llvm::orc;
 +
-+static std::atomic<pid_t> LaunchedExecutorPID{-1};
++static std::vector<pid_t> LaunchedExecutorPID;
 +
 +Expected<uint64_t> getSlabAllocSize(StringRef SizeString) {
 +  SizeString = SizeString.trim();
@@ -346,7 +351,7 @@ index 000000000..8324aeaaf
 +      exit(1);
 +    }
 +  } else {
-+     LaunchedExecutorPID = ChildPID;
++     LaunchedExecutorPID.push_back(ChildPID);
 +  }
 +  // else we're the parent...
 +
@@ -459,7 +464,15 @@ index 000000000..8324aeaaf
 +}
 +
 +pid_t getLastLaunchedExecutorPID() {
-+  return LaunchedExecutorPID;
++  if (!LaunchedExecutorPID.size())
++    return -1;
++  return LaunchedExecutorPID.back();
++}
++
++pid_t getNthLaunchedExecutorPID(int n) {
++  if (n - 1 < 0 || n - 1 >= static_cast<int>(LaunchedExecutorPID.size()))
++    return -1;
++  return LaunchedExecutorPID.at(n - 1);
 +}
 diff --git a/clang/test/Interpreter/out-of-process.cpp b/clang/test/Interpreter/out-of-process.cpp
 new file mode 100644