[clang] [clang-repl] Move the produced temporary files in wasm in a temp folder. (PR #175508)

[Vassil Vassilev via cfe-commits]

https://github.com/vgvassilev created https://github.com/llvm/llvm-project/pull/175508

This patch avoids bloating the current folder with temporary files created by wasm and moves them in a separate tmp directory. This patch is a version of a downstream one resolving this issue.

>From 0500e7260845f630b695324b26c392c8cafbe15f Mon Sep 17 00:00:00 2001
From: Vassil Vassilev <v.g.vassilev at gmail.com>
Date: Mon, 12 Jan 2026 09:30:53 +0000
Subject: [PATCH] [clang-repl] Move the produced temporary files in wasm in a
 temp folder.

This patch avoids bloating the current folder with temporary files created by
wasm and moves them in a separate tmp directory. This patch is a version of a
downstream one resolving this issue.
---
 clang/lib/Interpreter/IncrementalExecutor.cpp |  2 +-
 clang/lib/Interpreter/Wasm.cpp                | 32 ++++++++++++++++---
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/clang/lib/Interpreter/IncrementalExecutor.cpp b/clang/lib/Interpreter/IncrementalExecutor.cpp
index 001651522c329..74b751d0e2dae 100644
--- a/clang/lib/Interpreter/IncrementalExecutor.cpp
+++ b/clang/lib/Interpreter/IncrementalExecutor.cpp
@@ -404,7 +404,7 @@ IncrementalExecutorBuilder::create(llvm::orc::ThreadSafeContext &TSC,
   llvm::Error Err = llvm::Error::success();
   std::unique_ptr<IncrementalExecutor> Executor;
 #ifdef __EMSCRIPTEN__
-  Executor = std::make_unique<WasmIncrementalExecutor>();
+  Executor = std::make_unique<WasmIncrementalExecutor>(Err);
 #else
   Executor = std::make_unique<OrcIncrementalExecutor>(TSC, *JITBuilder, Err);
 #endif
diff --git a/clang/lib/Interpreter/Wasm.cpp b/clang/lib/Interpreter/Wasm.cpp
index 56f51e5d5311e..68bfb871367da 100644
--- a/clang/lib/Interpreter/Wasm.cpp
+++ b/clang/lib/Interpreter/Wasm.cpp
@@ -57,7 +57,20 @@ bool link(llvm::ArrayRef<const char *> args, llvm::raw_ostream &stdoutOS,
 
 namespace clang {
 
-WasmIncrementalExecutor::WasmIncrementalExecutor() = default;
+WasmIncrementalExecutor::WasmIncrementalExecutor(llvm::Error &Err) {
+  llvm::ErrorAsOutParameter EAO(&Err);
+
+  if (Err)
+    return;
+
+  if (auto EC =
+          llvm::sys::fs::createUniqueDirectory("clang-wasm-exec-", TempDir))
+    Err = llvm::make_error<llvm::StringError>(
+        "Failed to create temporary directory for Wasm executor: " +
+            EC.message(),
+        llvm::inconvertibleErrorCode());
+}
+
 WasmIncrementalExecutor::~WasmIncrementalExecutor() = default;
 
 llvm::Error WasmIncrementalExecutor::addModule(PartialTranslationUnit &PTU) {
@@ -74,11 +87,20 @@ llvm::Error WasmIncrementalExecutor::addModule(PartialTranslationUnit &PTU) {
   llvm::TargetMachine *TargetMachine = Target->createTargetMachine(
       PTU.TheModule->getTargetTriple(), "", "", TO, llvm::Reloc::Model::PIC_);
   PTU.TheModule->setDataLayout(TargetMachine->createDataLayout());
-  std::string ObjectFileName = PTU.TheModule->getName().str() + ".o";
-  std::string BinaryFileName = PTU.TheModule->getName().str() + ".wasm";
 
-  std::error_code Error;
-  llvm::raw_fd_ostream ObjectFileOutput(llvm::StringRef(ObjectFileName), Error);
+  llvm::SmallString<256> ObjectFileName(TempDir);
+  llvm::sys::path::append(ObjectFileName,
+                          PTU.TheModule->getName() + ".o");
+
+  llvm::SmallString<256> BinaryFileName(TempDir);
+  llvm::sys::path::append(BinaryFileName,
+                          PTU.TheModule->getName() + ".wasm");
+
+  std::error_code EC;
+  llvm::raw_fd_ostream ObjectFileOutput(ObjectFileName, EC);
+
+  if (EC)
+    return llvm::errorCodeToError(EC);
 
   llvm::legacy::PassManager PM;
   if (TargetMachine->addPassesToEmitFile(PM, ObjectFileOutput, nullptr,