cling/lib/Interpreter/IncrementalParser.h
Jonas Hahnfeld 092c9c981f Increase initial offset into virtual file
Otherwise the PresumedLoc's suddely get valid once we avoid a
completely empty soure buffer in the next commit.
2022-12-13 09:59:05 +01:00

267 lines
8.3 KiB
C++

//--------------------------------------------------------------------*- C++ -*-
// CLING - the C++ LLVM-based InterpreterG :)
// author: Axel Naumann <axel@cern.ch>
//
// This file is dual-licensed: you can choose to license it under the University
// of Illinois Open Source License or the GNU Lesser General Public License. See
// LICENSE.TXT for details.
//------------------------------------------------------------------------------
#ifndef CLING_INCREMENTAL_PARSER_H
#define CLING_INCREMENTAL_PARSER_H
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include <vector>
#include <deque>
#include <memory>
namespace llvm {
struct GenericValue;
class MemoryBuffer;
class Module;
}
namespace clang {
class ASTConsumer;
class CodeGenerator;
class CompilerInstance;
class DiagnosticConsumer;
class Decl;
class FileID;
class ModuleFileExtension;
class Parser;
}
namespace cling {
class CompilationOptions;
class DeclCollector;
class ExecutionContext;
class Interpreter;
class Transaction;
class TransactionPool;
class ASTTransformer;
///\brief Responsible for the incremental parsing and compilation of input.
///
/// The class manages the entire process of compilation line-by-line by
/// appending the compiled delta to clang'a AST. It provides basic operations
/// on the already compiled code. See cling::Transaction class.
///
class IncrementalParser {
private:
// our interpreter context
// FIXME: Get rid of that back reference to the interpreter.
Interpreter* m_Interpreter;
// compiler instance.
std::unique_ptr<clang::CompilerInstance> m_CI;
// parser (incremental)
std::unique_ptr<clang::Parser> m_Parser;
// One buffer for each command line, owner by the source file manager
std::deque<std::pair<llvm::MemoryBuffer*, clang::FileID>> m_MemoryBuffers;
// file ID of the memory buffer
clang::FileID m_VirtualFileID;
// The next available unique sourcelocation offset. Skip the system sloc 0
// and any offset that may actually exist in the virtual file.
unsigned m_VirtualFileLocOffset = 100;
// CI owns it
DeclCollector* m_Consumer;
///\brief The storage for our transactions.
///
/// We don't need the elements to be contiguous in memory, that is why we
/// don't use std::vector. We don't need to copy the elements every time the
/// capacity is exceeded.
///
std::deque<Transaction*> m_Transactions;
///\brief Number of created modules.
unsigned m_ModuleNo = 0;
///\brief Code generator
///
clang::CodeGenerator* m_CodeGen = nullptr;
///\brief Pool of reusable block-allocated transactions.
///
std::unique_ptr<TransactionPool> m_TransactionPool;
///\brief DiagnosticConsumer instance
///
std::unique_ptr<clang::DiagnosticConsumer> m_DiagConsumer;
using ModuleFileExtensions =
std::vector<std::shared_ptr<clang::ModuleFileExtension>>;
public:
enum EParseResult {
kSuccess,
kSuccessWithWarnings,
kFailed
};
typedef llvm::PointerIntPair<Transaction*, 2, EParseResult>
ParseResultTransaction;
IncrementalParser(Interpreter* interp, const char* llvmdir,
const ModuleFileExtensions& moduleExtensions);
~IncrementalParser();
///\brief Whether the IncrementalParser is valid.
///
///\param[in] initialized - check if IncrementalParser has been initialized.
///
bool isValid(bool initialized = true) const;
bool Initialize(llvm::SmallVectorImpl<ParseResultTransaction>& result,
bool isChildInterpreter);
clang::CompilerInstance* getCI() const { return m_CI.get(); }
clang::Parser* getParser() const { return m_Parser.get(); }
clang::CodeGenerator* getCodeGenerator() const { return m_CodeGen; }
bool hasCodeGenerator() const { return m_CodeGen; }
void setDiagnosticConsumer(clang::DiagnosticConsumer* Consumer, bool Own);
clang::DiagnosticConsumer* getDiagnosticConsumer() const;
/// Returns the next available unique source location. It is an offset into
/// the limitless virtual file. Each time this interface is used it bumps
/// an internal counter. This is very useful for using the various API in
/// clang which expect valid source locations.
clang::SourceLocation getNextAvailableUniqueSourceLoc();
/// \{
/// \name Transaction Support
///\brief Starts a transaction.
///
Transaction* beginTransaction(const CompilationOptions& Opts);
///\brief Finishes a transaction.
///
ParseResultTransaction endTransaction(Transaction* T);
///\brief Commits a transaction if it was complete. I.e pipes it
/// through the consumer chain, including codegen.
///
///\param[in] PRT - the transaction (ParseResultTransaction) to be
/// committed
///\param[in] ClearDiagClient - Reset the DiagnosticsEngine client or not
///
void commitTransaction(ParseResultTransaction& PRT,
bool ClearDiagClient = true);
///\brief Runs the consumers (e.g. CodeGen) on a non-parsed transaction.
///
///\param[in] T - the transaction to be consumed
///
void emitTransaction(Transaction* T);
///\brief Remove a Transaction from the collection of Transactions.
///
///\param[in] T - The transaction to be reverted from the AST
///
void deregisterTransaction(Transaction& T);
///\brief Returns the first transaction the incremental parser saw.
///
const Transaction* getFirstTransaction() const {
if (m_Transactions.empty())
return 0;
return m_Transactions.front();
}
///\brief Returns the last transaction the incremental parser saw.
///
Transaction* getLastTransaction() {
if (m_Transactions.empty())
return 0;
return m_Transactions.back();
}
///\brief Returns the last transaction the incremental parser saw.
///
const Transaction* getLastTransaction() const {
if (m_Transactions.empty())
return 0;
return m_Transactions.back();
}
///\brief Returns the most recent transaction with an input line wrapper,
/// which could well be the current one.
///
const Transaction* getLastWrapperTransaction() const;
///\brief Returns the currently active transaction.
///
const Transaction* getCurrentTransaction() const;
///\brief Add a user-generated transaction.
void addTransaction(Transaction* T);
///\brief Returns the list of transactions seen by the interpreter.
/// Intentionally makes a copy - that function is meant to be use for debug
/// purposes.
///
std::vector<const Transaction*> getAllTransactions();
/// \}
///\brief Compiles the given input with the given compilation options.
///
///\param[in] input - The code to compile.
///\param[in] Opts - The compilation options to use.
///\returns the declarations that were compiled.
///
ParseResultTransaction Compile(llvm::StringRef input, const CompilationOptions& Opts);
void printTransactionStructure() const;
///\brief Runs the static initializers created by codegening a transaction.
///
///\param[in] T - the transaction for which to run the initializers.
///
bool runStaticInitOnTransaction(Transaction* T) const;
///\brief Add the trnasformers to the Incremental Parser.
///
void SetTransformers(bool isChildInterpreter);
private:
///\brief Finalizes the consumers (e.g. CodeGen) on a transaction.
///
///\param[in] T - the transaction to be finalized
///
void codeGenTransaction(Transaction* T);
///\brief Initializes a virtual file, which will be able to produce valid
/// source locations, with the proper offsets.
///
void initializeVirtualFile();
///\brief The work horse for parsing. It queries directly clang.
///
///\param[in] input - The incremental input that needs to be parsed.
///
EParseResult ParseInternal(llvm::StringRef input);
///\brief Create a unique name for the next llvm::Module
///
std::string makeModuleName();
///\brief Create a new llvm::Module
///
llvm::Module* StartModule();
};
} // end namespace cling
#endif // CLING_INCREMENTAL_PARSER_H