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//===-- ExpressionParser.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_ExpressionParser_h_
#define liblldb_ExpressionParser_h_
#include "lldb/lldb-public.h"
#include "lldb/Core/Error.h"
namespace lldb_private
{
class IRExecutionUnit;
//----------------------------------------------------------------------
/// @class ExpressionParser ExpressionParser.h "lldb/Expression/ExpressionParser.h"
/// @brief Encapsulates an instance of a compiler that can parse expressions.
///
/// ExpressionParser is the base class for llvm based Expression parsers.
//----------------------------------------------------------------------
class 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.
//------------------------------------------------------------------
ExpressionParser (ExecutionContextScope *exe_scope,
Expression &expr,
bool generate_debug_info) :
m_expr(expr),
m_generate_debug_info(generate_debug_info)
{
}
//------------------------------------------------------------------
/// Destructor
//------------------------------------------------------------------
virtual ~ExpressionParser () {};
//------------------------------------------------------------------
/// Parse a single expression and convert it to IR using Clang. Don't
/// wrap the expression in anything at all.
///
/// @param[in] stream
/// The stream to print errors to.
///
/// @return
/// The number of errors encountered during parsing. 0 means
/// success.
//------------------------------------------------------------------
virtual unsigned
Parse (Stream &stream) = 0;
//------------------------------------------------------------------
/// 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] can_interpret
/// Set to true if the expression could be interpreted statically;
/// untouched otherwise.
///
/// @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().
//------------------------------------------------------------------
virtual Error
PrepareForExecution (lldb::addr_t &func_addr,
lldb::addr_t &func_end,
std::shared_ptr<IRExecutionUnit> &execution_unit_sp,
ExecutionContext &exe_ctx,
bool &can_interpret,
lldb_private::ExecutionPolicy execution_policy) = 0;
bool
GetGenerateDebugInfo () const
{
return m_generate_debug_info;
}
protected:
Expression & m_expr; ///< The expression to be parsed
bool m_generate_debug_info;
};
}
#endif // liblldb_ExpressionParser_h_
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