[clang] [clang-repl] Implement LoadDynamicLibrary for clang-repl wasm use cases (PR #133037)

[Anutosh Bhat via cfe-commits]

https://github.com/anutosh491 created https://github.com/llvm/llvm-project/pull/133037

None

>From dfe49e826705a5e9371e17e66e40c31602beea8e Mon Sep 17 00:00:00 2001
From: anutosh491 <andersonbhat491 at gmail.com>
Date: Wed, 26 Mar 2025 10:33:37 +0530
Subject: [PATCH] Implement LoadDynamicLibrary for clang-repl wasm use cases

---
 clang/lib/Interpreter/Interpreter.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index fa4c1439c9261..b4c68f340abc0 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Support/VirtualFileSystem.h"
 #ifdef __EMSCRIPTEN__
 #include "Wasm.h"
+#include <dlfcn.h>
 #endif // __EMSCRIPTEN__
 
 #include "clang/AST/ASTConsumer.h"
@@ -711,6 +712,14 @@ llvm::Error Interpreter::Undo(unsigned N) {
 }
 
 llvm::Error Interpreter::LoadDynamicLibrary(const char *name) {
+#ifdef __EMSCRIPTEN__
+  void* handle = dlopen(name, RTLD_NOW | RTLD_GLOBAL);
+  if (!handle) {
+    llvm::errs() << dlerror() << '\n';
+    return llvm::make_error<llvm::StringError>(
+        "Failed to load dynamic library", llvm::inconvertibleErrorCode());
+  }
+#else
   auto EE = getExecutionEngine();
   if (!EE)
     return EE.takeError();
@@ -722,6 +731,7 @@ llvm::Error Interpreter::LoadDynamicLibrary(const char *name) {
     EE->getMainJITDylib().addGenerator(std::move(*DLSG));
   else
     return DLSG.takeError();
+#endif
 
   return llvm::Error::success();
 }