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| //===-- Expression.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_Expression_h_
#define liblldb_Expression_h_
#include <map>
#include <string>
#include <vector>
#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" 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:
/// Discriminator for LLVM-style RTTI (dyn_cast<> et al.)
enum ExpressionKind {
eKindFunctionCaller,
eKindClangFunctionCaller,
eKindUserExpression,
eKindLLVMUserExpression,
eKindClangUserExpression,
eKindUtilityFunction,
eKindClangUtilityFunction,
};
enum ResultType { eResultTypeAny, eResultTypeId };
Expression(Target &target, ExpressionKind kind);
Expression(ExecutionContextScope &exe_scope, ExpressionKind kind);
/// 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; }
/// LLVM-style RTTI support.
ExpressionKind getKind() const { return m_kind; }
private:
/// LLVM-style RTTI support.
const ExpressionKind m_kind;
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_
|