1 //===--- tools/clang-repl/ClangRepl.cpp - clang-repl - the Clang REPL -----===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements a REPL tool on top of clang. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "clang/Basic/Diagnostic.h" 14 #include "clang/Frontend/CompilerInstance.h" 15 #include "clang/Frontend/FrontendDiagnostic.h" 16 #include "clang/Interpreter/Interpreter.h" 17 18 #include "llvm/ExecutionEngine/Orc/LLJIT.h" 19 #include "llvm/LineEditor/LineEditor.h" 20 #include "llvm/Support/CommandLine.h" 21 #include "llvm/Support/ManagedStatic.h" // llvm_shutdown 22 #include "llvm/Support/Signals.h" 23 #include "llvm/Support/TargetSelect.h" // llvm::Initialize* 24 25 static llvm::cl::list<std::string> 26 ClangArgs("Xcc", llvm::cl::ZeroOrMore, 27 llvm::cl::desc("Argument to pass to the CompilerInvocation"), 28 llvm::cl::CommaSeparated); 29 static llvm::cl::opt<bool> OptHostSupportsJit("host-supports-jit", 30 llvm::cl::Hidden); 31 static llvm::cl::list<std::string> OptInputs(llvm::cl::Positional, 32 llvm::cl::ZeroOrMore, 33 llvm::cl::desc("[code to run]")); 34 35 static void LLVMErrorHandler(void *UserData, const char *Message, 36 bool GenCrashDiag) { 37 auto &Diags = *static_cast<clang::DiagnosticsEngine *>(UserData); 38 39 Diags.Report(clang::diag::err_fe_error_backend) << Message; 40 41 // Run the interrupt handlers to make sure any special cleanups get done, in 42 // particular that we remove files registered with RemoveFileOnSignal. 43 llvm::sys::RunInterruptHandlers(); 44 45 // We cannot recover from llvm errors. When reporting a fatal error, exit 46 // with status 70 to generate crash diagnostics. For BSD systems this is 47 // defined as an internal software error. Otherwise, exit with status 1. 48 49 exit(GenCrashDiag ? 70 : 1); 50 } 51 52 llvm::ExitOnError ExitOnErr; 53 int main(int argc, const char **argv) { 54 ExitOnErr.setBanner("clang-repl: "); 55 llvm::cl::ParseCommandLineOptions(argc, argv); 56 57 std::vector<const char *> ClangArgv(ClangArgs.size()); 58 std::transform(ClangArgs.begin(), ClangArgs.end(), ClangArgv.begin(), 59 [](const std::string &s) -> const char * { return s.data(); }); 60 llvm::InitializeNativeTarget(); 61 llvm::InitializeNativeTargetAsmPrinter(); 62 63 if (OptHostSupportsJit) { 64 auto J = llvm::orc::LLJITBuilder().create(); 65 if (J) 66 llvm::outs() << "true\n"; 67 else { 68 llvm::consumeError(J.takeError()); 69 llvm::outs() << "false\n"; 70 } 71 return 0; 72 } 73 74 // FIXME: Investigate if we could use runToolOnCodeWithArgs from tooling. It 75 // can replace the boilerplate code for creation of the compiler instance. 76 auto CI = ExitOnErr(clang::IncrementalCompilerBuilder::create(ClangArgv)); 77 78 // Set an error handler, so that any LLVM backend diagnostics go through our 79 // error handler. 80 llvm::install_fatal_error_handler(LLVMErrorHandler, 81 static_cast<void *>(&CI->getDiagnostics())); 82 83 // Load any requested plugins. 84 CI->LoadRequestedPlugins(); 85 86 auto Interp = ExitOnErr(clang::Interpreter::create(std::move(CI))); 87 for (const std::string &input : OptInputs) { 88 if (auto Err = Interp->ParseAndExecute(input)) 89 llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: "); 90 } 91 92 if (OptInputs.empty()) { 93 llvm::LineEditor LE("clang-repl"); 94 // FIXME: Add LE.setListCompleter 95 while (llvm::Optional<std::string> Line = LE.readLine()) { 96 if (*Line == "quit") 97 break; 98 if (auto Err = Interp->ParseAndExecute(*Line)) 99 llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: "); 100 } 101 } 102 103 // Our error handler depends on the Diagnostics object, which we're 104 // potentially about to delete. Uninstall the handler now so that any 105 // later errors use the default handling behavior instead. 106 llvm::remove_fatal_error_handler(); 107 108 llvm::llvm_shutdown(); 109 110 return 0; 111 } 112