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//===--- tools/clang-repl/ClangRepl.cpp - clang-repl - the Clang REPL -----===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file implements a REPL tool on top of clang.
#include "clang/Basic/Diagnostic.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Interpreter/Interpreter.h"
#include "llvm/ExecutionEngine/Orc/LLJIT.h"
#include "llvm/LineEditor/LineEditor.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h" // llvm_shutdown
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h" // llvm::Initialize*
static llvm::cl::list<std::string>
ClangArgs("Xcc", llvm::cl::ZeroOrMore,
llvm::cl::desc("Argument to pass to the CompilerInvocation"),
static llvm::cl::opt<bool> OptHostSupportsJit("host-supports-jit",
static llvm::cl::list<std::string> OptInputs(llvm::cl::Positional,
llvm::cl::desc("[code to run]"));
static void LLVMErrorHandler(void *UserData, const char *Message,
bool GenCrashDiag) {
auto &Diags = *static_cast<clang::DiagnosticsEngine *>(UserData);
Diags.Report(clang::diag::err_fe_error_backend) << Message;
// Run the interrupt handlers to make sure any special cleanups get done, in
// particular that we remove files registered with RemoveFileOnSignal.
// We cannot recover from llvm errors. When reporting a fatal error, exit
// with status 70 to generate crash diagnostics. For BSD systems this is
// defined as an internal software error. Otherwise, exit with status 1.
exit(GenCrashDiag ? 70 : 1);
llvm::ExitOnError ExitOnErr;
int main(int argc, const char **argv) {
ExitOnErr.setBanner("clang-repl: ");
llvm::cl::ParseCommandLineOptions(argc, argv);
std::vector<const char *> ClangArgv(ClangArgs.size());
std::transform(ClangArgs.begin(), ClangArgs.end(), ClangArgv.begin(),
[](const std::string &s) -> const char * { return; });
if (OptHostSupportsJit) {
auto J = llvm::orc::LLJITBuilder().create();
if (J)
llvm::outs() << "true\n";
else {
llvm::outs() << "false\n";
return 0;
// FIXME: Investigate if we could use runToolOnCodeWithArgs from tooling. It
// can replace the boilerplate code for creation of the compiler instance.
auto CI = ExitOnErr(clang::IncrementalCompilerBuilder::create(ClangArgv));
// Set an error handler, so that any LLVM backend diagnostics go through our
// error handler.
static_cast<void *>(&CI->getDiagnostics()));
// Load any requested plugins.
auto Interp = ExitOnErr(clang::Interpreter::create(std::move(CI)));
for (const std::string &input : OptInputs) {
if (auto Err = Interp->ParseAndExecute(input))
llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
if (OptInputs.empty()) {
llvm::LineEditor LE("clang-repl");
// FIXME: Add LE.setListCompleter
while (llvm::Optional<std::string> Line = LE.readLine()) {
if (*Line == "quit")
if (auto Err = Interp->ParseAndExecute(*Line))
llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
// Our error handler depends on the Diagnostics object, which we're
// potentially about to delete. Uninstall the handler now so that any
// later errors use the default handling behavior instead.
return 0;