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//===-- Expression.h --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_Expression_h_
#define liblldb_Expression_h_
// C Includes
// C++ Includes
#include <map>
#include <string>
#include <vector>
// Other libraries and framework includes
// Project includes
#include "lldb/Expression/ExpressionTypeSystemHelper.h"
#include "lldb/lldb-forward.h"
#include "lldb/lldb-private.h"
namespace lldb_private {
class RecordingMemoryManager;
//----------------------------------------------------------------------
/// @class Expression Expression.h "lldb/Expression/Expression.h"
/// @brief Encapsulates a single expression for use in lldb
///
/// LLDB uses expressions for various purposes, notably to call functions
/// and as a backend for the expr command. Expression encapsulates
/// the objects needed to parse and interpret or JIT an expression. It
/// uses the expression parser appropriate to the language of the expression
/// to produce LLVM IR from the expression.
//----------------------------------------------------------------------
class Expression {
public:
enum ResultType { eResultTypeAny, eResultTypeId };
Expression(Target &target);
Expression(ExecutionContextScope &exe_scope);
//------------------------------------------------------------------
/// Destructor
//------------------------------------------------------------------
virtual ~Expression() {}
//------------------------------------------------------------------
/// Return the string that the parser should parse. Must be a full
/// translation unit.
//------------------------------------------------------------------
virtual const char *Text() = 0;
//------------------------------------------------------------------
/// Return the function name that should be used for executing the
/// expression. Text() should contain the definition of this
/// function.
//------------------------------------------------------------------
virtual const char *FunctionName() = 0;
//------------------------------------------------------------------
/// Return the language that should be used when parsing. To use
/// the default, return eLanguageTypeUnknown.
//------------------------------------------------------------------
virtual lldb::LanguageType Language() { return lldb::eLanguageTypeUnknown; }
//------------------------------------------------------------------
/// Return the desired result type of the function, or
/// eResultTypeAny if indifferent.
//------------------------------------------------------------------
virtual ResultType DesiredResultType() { return eResultTypeAny; }
//------------------------------------------------------------------
/// Flags
//------------------------------------------------------------------
//------------------------------------------------------------------
/// Return true if validation code should be inserted into the
/// expression.
//------------------------------------------------------------------
virtual bool NeedsValidation() = 0;
//------------------------------------------------------------------
/// Return true if external variables in the expression should be
/// resolved.
//------------------------------------------------------------------
virtual bool NeedsVariableResolution() = 0;
virtual EvaluateExpressionOptions *GetOptions() { return nullptr; };
//------------------------------------------------------------------
/// Return the address of the function's JIT-compiled code, or
/// LLDB_INVALID_ADDRESS if the function is not JIT compiled
//------------------------------------------------------------------
lldb::addr_t StartAddress() { return m_jit_start_addr; }
//------------------------------------------------------------------
/// Called to notify the expression that it is about to be executed.
//------------------------------------------------------------------
virtual void WillStartExecuting() {}
//------------------------------------------------------------------
/// Called to notify the expression that its execution has finished.
//------------------------------------------------------------------
virtual void DidFinishExecuting() {}
virtual ExpressionTypeSystemHelper *GetTypeSystemHelper() { return nullptr; }
protected:
lldb::TargetWP m_target_wp; /// Expression's always have to have a target...
lldb::ProcessWP m_jit_process_wp; /// An expression might have a process, but
/// it doesn't need to (e.g. calculator
/// mode.)
lldb::addr_t m_jit_start_addr; ///< The address of the JITted function within
///the JIT allocation. LLDB_INVALID_ADDRESS if
///invalid.
lldb::addr_t m_jit_end_addr; ///< The address of the JITted function within
///the JIT allocation. LLDB_INVALID_ADDRESS if
///invalid.
};
} // namespace lldb_private
#endif // liblldb_Expression_h_
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