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      1 //===--- IncrementalExecutor.cpp - Incremental Execution --------*- C++ -*-===//
      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 the class which performs incremental code execution.
     10 //
     11 //===----------------------------------------------------------------------===//
     12 
     13 #include "IncrementalExecutor.h"
     14 
     15 #include "llvm/ExecutionEngine/ExecutionEngine.h"
     16 #include "llvm/ExecutionEngine/Orc/CompileUtils.h"
     17 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
     18 #include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
     19 #include "llvm/ExecutionEngine/Orc/LLJIT.h"
     20 #include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
     21 #include "llvm/ExecutionEngine/SectionMemoryManager.h"
     22 #include "llvm/IR/Module.h"
     23 #include "llvm/Support/ManagedStatic.h"
     24 #include "llvm/Support/TargetSelect.h"
     25 
     26 namespace clang {
     27 
     28 IncrementalExecutor::IncrementalExecutor(llvm::orc::ThreadSafeContext &TSC,
     29                                          llvm::Error &Err,
     30                                          const llvm::Triple &Triple)
     31     : TSCtx(TSC) {
     32   using namespace llvm::orc;
     33   llvm::ErrorAsOutParameter EAO(&Err);
     34 
     35   auto JTMB = JITTargetMachineBuilder(Triple);
     36   if (auto JitOrErr = LLJITBuilder().setJITTargetMachineBuilder(JTMB).create())
     37     Jit = std::move(*JitOrErr);
     38   else {
     39     Err = JitOrErr.takeError();
     40     return;
     41   }
     42 
     43   const char Pref = Jit->getDataLayout().getGlobalPrefix();
     44   // Discover symbols from the process as a fallback.
     45   if (auto PSGOrErr = DynamicLibrarySearchGenerator::GetForCurrentProcess(Pref))
     46     Jit->getMainJITDylib().addGenerator(std::move(*PSGOrErr));
     47   else {
     48     Err = PSGOrErr.takeError();
     49     return;
     50   }
     51 }
     52 
     53 IncrementalExecutor::~IncrementalExecutor() {}
     54 
     55 llvm::Error IncrementalExecutor::addModule(std::unique_ptr<llvm::Module> M) {
     56   return Jit->addIRModule(llvm::orc::ThreadSafeModule(std::move(M), TSCtx));
     57 }
     58 
     59 llvm::Error IncrementalExecutor::runCtors() const {
     60   return Jit->initialize(Jit->getMainJITDylib());
     61 }
     62 
     63 } // end namespace clang
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