Interpreter.h

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//===--- Interpreter.h - Incremental Compilation and Execution---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the component which performs incremental code
// compilation and execution.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_INTERPRETER_INTERPRETER_H
#define LLVM_CLANG_INTERPRETER_INTERPRETER_H
 
#include "clang/AST/GlobalDecl.h"
#include "clang/Interpreter/IncrementalExecutor.h"
#include "clang/Interpreter/PartialTranslationUnit.h"
#include "clang/Interpreter/Value.h"
 
#include "llvm/ADT/DenseMap.h"
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/Orc/ExecutorProcessControl.h"
#include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h"
#include "llvm/Support/Error.h"
#include <cstdint>
#include <memory>
#include <vector>
 
namespace llvm {
namespace orc {
class ThreadSafeContext;
} // namespace orc
} // namespace llvm
 
namespace clang {
 
namespace driver {
class Compilation;
} // namespace driver
 
class CompilerInstance;
class CXXRecordDecl;
class Decl;
class IncrementalParser;
class IncrementalDeviceParser;
 
/// The device language to offload to. \c Detect selects the vendor of the
/// device available on the machine.
enum class OffloadType { Detect, CUDA, HIP };
 
/// Create a pre-configured \c CompilerInstance for incremental processing.
class IncrementalCompilerBuilder {
  using DriverCompilationFn = llvm::Error(const driver::Compilation &);
 
public:
  IncrementalCompilerBuilder() {}
 
  void SetCompilerArgs(const std::vector<const char *> &Args) {
    UserArgs = Args;
  }
 
  void SetTargetTriple(std::string TT) { TargetTriple = TT; }
 
  // General C++
  llvm::Expected<std::unique_ptr<CompilerInstance>> CreateCpp();
 
  // Offload options
  void SetOffloadArch(llvm::StringRef Arch) { OffloadArch = Arch; };
 
  // The SDK path (CUDA or ROCm) of the device language being offloaded to.
  void SetDeviceSDK(llvm::StringRef Path) { DeviceSDKPath = Path; }
 
  // Hand over the compilation.
  void SetDriverCompilationCallback(std::function<DriverCompilationFn> C) {
    CompilationCB = C;
  }
 
  llvm::Expected<std::unique_ptr<CompilerInstance>>
  CreateHost(OffloadType Type);
  llvm::Expected<std::unique_ptr<CompilerInstance>>
  CreateDevice(OffloadType Type);
 
private:
  llvm::Expected<std::unique_ptr<CompilerInstance>>
  create(std::string TT, std::vector<const char *> &ClangArgv);
 
  llvm::Expected<std::unique_ptr<CompilerInstance>>
  createOffload(bool device, OffloadType Type = OffloadType::Detect);
 
  std::vector<const char *> UserArgs;
  std::optional<std::string> TargetTriple;
 
  llvm::StringRef OffloadArch;
  llvm::StringRef DeviceSDKPath;
 
  std::string OffloadCUID;
 
  std::optional<std::function<DriverCompilationFn>> CompilationCB;
};
 
class IncrementalAction;
class InProcessPrintingASTConsumer;
 
/// Provides top-level interfaces for incremental compilation and execution.
class Interpreter {
  friend class Value;
  friend InProcessPrintingASTConsumer;
 
  std::unique_ptr<llvm::orc::ThreadSafeContext> TSCtx;
  /// Long-lived, incremental parsing action.
  std::unique_ptr<IncrementalAction> Act;
  std::unique_ptr<IncrementalParser> IncrParser;
  std::unique_ptr<IncrementalExecutor> IncrExecutor;
 
  // An optional parser for CUDA offloading
  std::unique_ptr<IncrementalDeviceParser> DeviceParser;
 
  // An optional action for CUDA offloading
  std::unique_ptr<IncrementalAction> DeviceAct;
 
  /// List containing information about each incrementally parsed piece of code.
  std::list<PartialTranslationUnit> PTUs;
 
  unsigned InitPTUSize = 0;
 
  // This member holds the last result of the value printing. It's a class
  // member because we might want to access it after more inputs. If no value
  // printing happens, it's in an invalid state.
  Value LastValue;
 
  /// Compiler instance performing the incremental compilation.
  std::unique_ptr<CompilerInstance> CI;
 
  /// An optional compiler instance for CUDA offloading
  std::unique_ptr<CompilerInstance> DeviceCI;
 
protected:
  // Derived classes can use an extended interface of the Interpreter.
  Interpreter(std::unique_ptr<CompilerInstance> Instance, llvm::Error &Err,
              std::unique_ptr<IncrementalExecutorBuilder> IEB = nullptr,
              std::unique_ptr<clang::ASTConsumer> Consumer = nullptr);
 
  // Create the internal IncrementalExecutor, or re-create it after calling
  // ResetExecutor().
  llvm::Error CreateExecutor();
 
  // Delete the internal IncrementalExecutor. This causes a hard shutdown of the
  // JIT engine. In particular, it doesn't run cleanup or destructors.
  void ResetExecutor() { IncrExecutor.reset(); }
 
public:
  virtual ~Interpreter();
  static llvm::Expected<std::unique_ptr<Interpreter>>
  create(std::unique_ptr<CompilerInstance> CI,
         std::unique_ptr<IncrementalExecutorBuilder> IEB = nullptr);
  static llvm::Expected<std::unique_ptr<Interpreter>>
  createWithDevice(std::unique_ptr<CompilerInstance> CI,
                   std::unique_ptr<CompilerInstance> DCI,
                   OffloadType Type = OffloadType::Detect);
 
  const ASTContext &getASTContext() const;
  ASTContext &getASTContext();
  const CompilerInstance *getCompilerInstance() const;
  CompilerInstance *getCompilerInstance();
  llvm::Expected<IncrementalExecutor &> getExecutionEngine();
 
  llvm::Expected<PartialTranslationUnit &> Parse(llvm::StringRef Code);
  llvm::Error Execute(PartialTranslationUnit &T);
  llvm::Error ParseAndExecute(llvm::StringRef Code, Value *V = nullptr);
 
  /// Set the optimization level and size used to emit subsequently parsed
  /// input. \p OptSize mirrors \c CodeGenOptions::OptimizeSize (1 for -Os,
  /// 2 for -Oz).
  void setOptLevel(unsigned OptLevel, unsigned OptSize = 0);
 
  /// Undo N previous incremental inputs.
  llvm::Error Undo(unsigned N = 1);
 
  /// Link a dynamic library
  llvm::Error LoadDynamicLibrary(const char *name);
 
  /// \returns the \c ExecutorAddr of a \c GlobalDecl. This interface uses
  /// the CodeGenModule's internal mangling cache to avoid recomputing the
  /// mangled name.
  llvm::Expected<llvm::orc::ExecutorAddr> getSymbolAddress(GlobalDecl GD) const;
 
  /// \returns the \c ExecutorAddr of a given name as written in the IR.
  llvm::Expected<llvm::orc::ExecutorAddr>
  getSymbolAddress(llvm::StringRef IRName) const;
 
  /// \returns the \c ExecutorAddr of a given name as written in the object
  /// file.
  llvm::Expected<llvm::orc::ExecutorAddr>
  getSymbolAddressFromLinkerName(llvm::StringRef LinkerName) const;
 
  const IncrementalExecutorBuilder &getIncrementalExecutorBuilder() const {
    return *IncrExecutorBuilder;
  }
 
private:
  size_t getEffectivePTUSize() const;
  void markUserCodeStart();
 
  // A cache for the compiled destructors used to for de-allocation of managed
  // clang::Values.
  mutable llvm::DenseMap<CXXRecordDecl *, llvm::orc::ExecutorAddr> Dtors;
 
  std::array<Expr *, 4> ValuePrintingInfo = {0};
 
  std::unique_ptr<IncrementalExecutorBuilder> IncrExecutorBuilder;
 
  /// @}
  /// @name Value and pretty printing support
  /// @{
 
  std::string ValueDataToString(const Value &V) const;
  std::string ValueTypeToString(const Value &V) const;
 
  llvm::Expected<Expr *> convertExprToValue(Expr *E);
 
  // When we deallocate clang::Value we need to run the destructor of the type.
  // This function forces emission of the needed dtor.
  llvm::Expected<llvm::orc::ExecutorAddr>
  CompileDtorCall(CXXRecordDecl *CXXRD) const;
};
} // namespace clang
 
#endif // LLVM_CLANG_INTERPRETER_INTERPRETER_H