https://github.com/anutosh491 created
https://github.com/llvm/llvm-project/pull/117978
None
>From 987f77db9d45dee264c60f434652131438784f6f Mon Sep 17 00:00:00 2001
From: anutosh491 <andersonbhat...@gmail.com>
Date: Thu, 28 Nov 2024 14:02:00 +0530
Subject: [PATCH] Fix generation of wasm binaries while running clang-repl in
browser
---
clang/lib/Interpreter/CMakeLists.txt | 2 +
clang/lib/Interpreter/Interpreter.cpp | 1 +
clang/lib/Interpreter/Wasm.cpp | 57 ++++++++++++++++++++-------
3 files changed, 45 insertions(+), 15 deletions(-)
diff --git a/clang/lib/Interpreter/CMakeLists.txt
b/clang/lib/Interpreter/CMakeLists.txt
index df7ea82e0dada5..bf70cdfbee01e1 100644
--- a/clang/lib/Interpreter/CMakeLists.txt
+++ b/clang/lib/Interpreter/CMakeLists.txt
@@ -16,6 +16,7 @@ set(LLVM_LINK_COMPONENTS
if (EMSCRIPTEN AND "lld" IN_LIST LLVM_ENABLE_PROJECTS)
set(WASM_SRC Wasm.cpp)
set(WASM_LINK lldWasm)
+ set(COMMON_LINK lldCommon)
endif()
add_clang_library(clangInterpreter
@@ -47,6 +48,7 @@ add_clang_library(clangInterpreter
clangSema
clangSerialization
${WASM_LINK}
+ ${COMMON_LINK}
)
if ((MINGW OR CYGWIN) AND BUILD_SHARED_LIBS)
diff --git a/clang/lib/Interpreter/Interpreter.cpp
b/clang/lib/Interpreter/Interpreter.cpp
index 5dc67f6375098f..887b494ff98f19 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -201,6 +201,7 @@ IncrementalCompilerBuilder::CreateCpp() {
Argv.push_back("-target");
Argv.push_back("wasm32-unknown-emscripten");
Argv.push_back("-shared");
+ Argv.push_back("-fvisibility=default");
#endif
Argv.insert(Argv.end(), UserArgs.begin(), UserArgs.end());
diff --git a/clang/lib/Interpreter/Wasm.cpp b/clang/lib/Interpreter/Wasm.cpp
index 79efbaa03982d0..0fd6ad509c2938 100644
--- a/clang/lib/Interpreter/Wasm.cpp
+++ b/clang/lib/Interpreter/Wasm.cpp
@@ -23,6 +23,31 @@
#include <string>
namespace lld {
+enum Flavor {
+ Invalid,
+ Gnu, // -flavor gnu
+ MinGW, // -flavor gnu MinGW
+ WinLink, // -flavor link
+ Darwin, // -flavor darwin
+ Wasm, // -flavor wasm
+};
+
+using Driver = bool (*)(llvm::ArrayRef<const char *>, llvm::raw_ostream &,
+ llvm::raw_ostream &, bool, bool);
+
+struct DriverDef {
+ Flavor f;
+ Driver d;
+};
+
+struct Result {
+ int retCode;
+ bool canRunAgain;
+};
+
+Result lldMain(llvm::ArrayRef<const char *> args, llvm::raw_ostream &stdoutOS,
+ llvm::raw_ostream &stderrOS, llvm::ArrayRef<DriverDef>
drivers);
+
namespace wasm {
bool link(llvm::ArrayRef<const char *> args, llvm::raw_ostream &stdoutOS,
llvm::raw_ostream &stderrOS, bool exitEarly, bool disableOutput);
@@ -51,45 +76,47 @@ 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 OutputFileName = PTU.TheModule->getName().str() + ".wasm";
+ std::string ObjectFileName = PTU.TheModule->getName().str() + ".o"; // For
the wasm object
+ std::string BinaryFileName = PTU.TheModule->getName().str() + ".wasm"; //
For the wasm binary
std::error_code Error;
- llvm::raw_fd_ostream OutputFile(llvm::StringRef(OutputFileName), Error);
+ llvm::raw_fd_ostream ObjectFileOutput(llvm::StringRef(ObjectFileName),
Error);
llvm::legacy::PassManager PM;
- if (TargetMachine->addPassesToEmitFile(PM, OutputFile, nullptr,
+ if (TargetMachine->addPassesToEmitFile(PM, ObjectFileOutput, nullptr,
llvm::CodeGenFileType::ObjectFile)) {
return llvm::make_error<llvm::StringError>(
"Wasm backend cannot produce object.", llvm::inconvertibleErrorCode());
}
if (!PM.run(*PTU.TheModule)) {
-
return llvm::make_error<llvm::StringError>("Failed to emit Wasm object.",
llvm::inconvertibleErrorCode());
}
- OutputFile.close();
+ ObjectFileOutput.close();
std::vector<const char *> LinkerArgs = {"wasm-ld",
"-shared",
"--import-memory",
- "--no-entry",
- "--export-all",
"--experimental-pic",
"--stack-first",
"--allow-undefined",
- OutputFileName.c_str(),
+ ObjectFileName.c_str(),
"-o",
- OutputFileName.c_str()};
- int Result =
- lld::wasm::link(LinkerArgs, llvm::outs(), llvm::errs(), false, false);
- if (!Result)
+ BinaryFileName.c_str()};
+
+ const lld::DriverDef WasmDriver = {lld::Flavor::Wasm, &lld::wasm::link};
+ std::vector<lld::DriverDef> WasmDriverArgs;
+ WasmDriverArgs.push_back(WasmDriver);
+ lld::Result Result = lld::lldMain(LinkerArgs, llvm::outs(), llvm::errs(),
WasmDriverArgs);
+
+ if (Result.retCode != 0)
return llvm::make_error<llvm::StringError>(
"Failed to link incremental module", llvm::inconvertibleErrorCode());
void *LoadedLibModule =
- dlopen(OutputFileName.c_str(), RTLD_NOW | RTLD_GLOBAL);
+ dlopen(BinaryFileName.c_str(), RTLD_NOW | RTLD_GLOBAL);
if (LoadedLibModule == nullptr) {
llvm::errs() << dlerror() << '\n';
return llvm::make_error<llvm::StringError>(
@@ -109,7 +136,7 @@ llvm::Error WasmIncrementalExecutor::runCtors() const {
return llvm::Error::success();
}
-llvm::Error WasmIncrementalExecutor::cleanUp() const {
+llvm::Error WasmIncrementalExecutor::cleanUp() {
// Can't call cleanUp through IncrementalExecutor as it
// tries to deinitialize JIT which hasn't been initialized
return llvm::Error::success();
@@ -117,4 +144,4 @@ llvm::Error WasmIncrementalExecutor::cleanUp() const {
WasmIncrementalExecutor::~WasmIncrementalExecutor() = default;
-} // namespace clang
+} // namespace clang
\ No newline at end of file
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