clang/lib/Interpreter/IncrementalExecutor.cpp

   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 "clang/Basic/TargetInfo.h"
  16 #include "clang/Basic/TargetOptions.h"
  17 #include "clang/Interpreter/PartialTranslationUnit.h"
  18 #include "llvm/ExecutionEngine/ExecutionEngine.h"
  19 #include "llvm/ExecutionEngine/Orc/CompileUtils.h"
  20 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
  21 #include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
  22 #include "llvm/ExecutionEngine/Orc/LLJIT.h"
  23 #include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
  24 #include "llvm/ExecutionEngine/SectionMemoryManager.h"
  25 #include "llvm/IR/Module.h"
  26 #include "llvm/Support/ManagedStatic.h"
  27 #include "llvm/Support/TargetSelect.h"
  28
  29 namespace clang {
  30
  31 IncrementalExecutor::IncrementalExecutor(llvm::orc::ThreadSafeContext &TSC,
  32                                          llvm::Error &Err,
  33                                          const clang::TargetInfo &TI)
  34     : TSCtx(TSC) {
  35   using namespace llvm::orc;
  36   llvm::ErrorAsOutParameter EAO(&Err);
  37
  38   auto JTMB = JITTargetMachineBuilder(TI.getTriple());
  39   JTMB.addFeatures(TI.getTargetOpts().Features);
  40   if (auto JitOrErr = LLJITBuilder().setJITTargetMachineBuilder(JTMB).create())
  41     Jit = std::move(*JitOrErr);
  42   else {
  43     Err = JitOrErr.takeError();
  44     return;
  45   }
  46
  47   const char Pref = Jit->getDataLayout().getGlobalPrefix();
  48   // Discover symbols from the process as a fallback.
  49   if (auto PSGOrErr = DynamicLibrarySearchGenerator::GetForCurrentProcess(Pref))
  50     Jit->getMainJITDylib().addGenerator(std::move(*PSGOrErr));
  51   else {
  52     Err = PSGOrErr.takeError();
  53     return;
  54   }
  55 }
  56
  57 IncrementalExecutor::~IncrementalExecutor() {}
  58
  59 llvm::Error IncrementalExecutor::addModule(PartialTranslationUnit &PTU) {
  60   llvm::orc::ResourceTrackerSP RT =
  61       Jit->getMainJITDylib().createResourceTracker();
  62   ResourceTrackers[&PTU] = RT;
  63
  64   return Jit->addIRModule(RT, {std::move(PTU.TheModule), TSCtx});
  65 }
  66
  67 llvm::Error IncrementalExecutor::removeModule(PartialTranslationUnit &PTU) {
  68
  69   llvm::orc::ResourceTrackerSP RT = std::move(ResourceTrackers[&PTU]);
  70   if (!RT)
  71     return llvm::Error::success();
  72
  73   ResourceTrackers.erase(&PTU);
  74   if (llvm::Error Err = RT->remove())
  75     return Err;
  76   return llvm::Error::success();
  77 }
  78
  79 // Clean up the JIT instance.
  80 llvm::Error IncrementalExecutor::cleanUp() {
  81   // This calls the global dtors of registered modules.
  82   return Jit->deinitialize(Jit->getMainJITDylib());
  83 }
  84
  85 llvm::Error IncrementalExecutor::runCtors() const {
  86   return Jit->initialize(Jit->getMainJITDylib());
  87 }
  88
  89 llvm::Expected<llvm::JITTargetAddress>
  90 IncrementalExecutor::getSymbolAddress(llvm::StringRef Name,
  91                                       SymbolNameKind NameKind) const {
  92   auto Sym = (NameKind == LinkerName) ? Jit->lookupLinkerMangled(Name)
  93                                       : Jit->lookup(Name);
  94
  95   if (!Sym)
  96     return Sym.takeError();
  97   return Sym->getValue();
  98 }
  99
 100 } // end namespace clang