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//===-- ClangExpressionParser.h ---------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ClangExpressionParser_h_
#define liblldb_ClangExpressionParser_h_
#include "lldb/Core/ClangForward.h"
#include "lldb/Expression/DiagnosticManager.h"
#include "lldb/Expression/ExpressionParser.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-public.h"
#include <string>
#include <vector>
namespace clang {
class CodeCompleteConsumer;
}
namespace lldb_private {
class IRExecutionUnit;
//----------------------------------------------------------------------
/// @class ClangExpressionParser ClangExpressionParser.h
/// "lldb/Expression/ClangExpressionParser.h" Encapsulates an instance of
/// Clang that can parse expressions.
///
/// ClangExpressionParser is responsible for preparing an instance of
/// ClangExpression for execution. ClangExpressionParser uses ClangExpression
/// as a glorified parameter list, performing the required parsing and
/// conversion to formats (DWARF bytecode, or JIT compiled machine code) that
/// can be executed.
//----------------------------------------------------------------------
class ClangExpressionParser : public ExpressionParser {
public:
//------------------------------------------------------------------
/// Constructor
///
/// Initializes class variables.
///
/// @param[in] exe_scope,
/// If non-NULL, an execution context scope that can help to
/// correctly create an expression with a valid process for
/// optional tuning Objective-C runtime support. Can be NULL.
///
/// @param[in] expr
/// The expression to be parsed.
//------------------------------------------------------------------
ClangExpressionParser(ExecutionContextScope *exe_scope, Expression &expr,
bool generate_debug_info);
//------------------------------------------------------------------
/// Destructor
//------------------------------------------------------------------
~ClangExpressionParser() override;
bool Complete(CompletionRequest &request, unsigned line, unsigned pos,
unsigned typed_pos) override;
//------------------------------------------------------------------
/// Parse a single expression and convert it to IR using Clang. Don't wrap
/// the expression in anything at all.
///
/// @param[in] diagnostic_manager
/// The diagnostic manager to report errors to.
///
/// @return
/// The number of errors encountered during parsing. 0 means
/// success.
//------------------------------------------------------------------
unsigned Parse(DiagnosticManager &diagnostic_manager) override;
bool RewriteExpression(DiagnosticManager &diagnostic_manager) override;
//------------------------------------------------------------------
/// Ready an already-parsed expression for execution, possibly evaluating it
/// statically.
///
/// @param[out] func_addr
/// The address to which the function has been written.
///
/// @param[out] func_end
/// The end of the function's allocated memory region. (func_addr
/// and func_end do not delimit an allocated region; the allocated
/// region may begin before func_addr.)
///
/// @param[in] execution_unit_sp
/// After parsing, ownership of the execution unit for
/// for the expression is handed to this shared pointer.
///
/// @param[in] exe_ctx
/// The execution context to write the function into.
///
/// @param[out] evaluated_statically
/// Set to true if the expression could be interpreted statically;
/// untouched otherwise.
///
/// @param[out] const_result
/// If the result of the expression is constant, and the
/// expression has no side effects, this is set to the result of the
/// expression.
///
/// @param[in] execution_policy
/// Determines whether the expression must be JIT-compiled, must be
/// evaluated statically, or whether this decision may be made
/// opportunistically.
///
/// @return
/// An error code indicating the success or failure of the operation.
/// Test with Success().
//------------------------------------------------------------------
Status
PrepareForExecution(lldb::addr_t &func_addr, lldb::addr_t &func_end,
lldb::IRExecutionUnitSP &execution_unit_sp,
ExecutionContext &exe_ctx, bool &can_interpret,
lldb_private::ExecutionPolicy execution_policy) override;
//------------------------------------------------------------------
/// Run all static initializers for an execution unit.
///
/// @param[in] execution_unit_sp
/// The execution unit.
///
/// @param[in] exe_ctx
/// The execution context to use when running them. Thread can't be null.
///
/// @return
/// The error code indicating the
//------------------------------------------------------------------
Status RunStaticInitializers(lldb::IRExecutionUnitSP &execution_unit_sp,
ExecutionContext &exe_ctx);
//------------------------------------------------------------------
/// Returns a string representing current ABI.
///
/// @param[in] target_arch
/// The target architecture.
///
/// @return
/// A string representing target ABI for the current architecture.
//-------------------------------------------------------------------
std::string GetClangTargetABI(const ArchSpec &target_arch);
private:
//------------------------------------------------------------------
/// Parses the expression.
///
/// @param[in] diagnostic_manager
/// The diagnostic manager that should receive the diagnostics
/// from the parsing process.
///
/// @param[in] completion
/// The completion consumer that should be used during parsing
/// (or a nullptr if no consumer should be attached).
///
/// @param[in] completion_line
/// The line in which the completion marker should be placed.
/// The first line is represented by the value 0.
///
/// @param[in] completion_column
/// The column in which the completion marker should be placed.
/// The first column is represented by the value 0.
///
/// @return
/// The number of parsing errors.
//-------------------------------------------------------------------
unsigned ParseInternal(DiagnosticManager &diagnostic_manager,
clang::CodeCompleteConsumer *completion = nullptr,
unsigned completion_line = 0,
unsigned completion_column = 0);
std::unique_ptr<llvm::LLVMContext>
m_llvm_context; ///< The LLVM context to generate IR into
std::unique_ptr<clang::FileManager>
m_file_manager; ///< The Clang file manager object used by the compiler
std::unique_ptr<clang::CompilerInstance>
m_compiler; ///< The Clang compiler used to parse expressions into IR
std::unique_ptr<clang::CodeGenerator>
m_code_generator; ///< The Clang object that generates IR
class LLDBPreprocessorCallbacks;
LLDBPreprocessorCallbacks *m_pp_callbacks; ///< Called when the preprocessor
///encounters module imports
std::unique_ptr<ClangASTContext> m_ast_context;
};
}
#endif // liblldb_ClangExpressionParser_h_
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