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//===-- UtilityFunction.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 LLDB_EXPRESSION_UTILITYFUNCTION_H
#define LLDB_EXPRESSION_UTILITYFUNCTION_H
#include <memory>
#include <string>
#include "lldb/Expression/Expression.h"
#include "lldb/lldb-forward.h"
#include "lldb/lldb-private.h"
namespace lldb_private {
/// \class UtilityFunction UtilityFunction.h
/// "lldb/Expression/UtilityFunction.h" Encapsulates a bit of source code that
/// provides a function that is callable
///
/// LLDB uses expressions for various purposes, notably to call functions
/// and as a backend for the expr command. UtilityFunction encapsulates a
/// self-contained function meant to be used from other code. Utility
/// functions can perform error-checking for ClangUserExpressions,
class UtilityFunction : public Expression {
// LLVM RTTI support
static char ID;
public:
bool isA(const void *ClassID) const override { return ClassID == &ID; }
static bool classof(const Expression *obj) { return obj->isA(&ID); }
/// Constructor
///
/// \param[in] text
/// The text of the function. Must be a full translation unit.
///
/// \param[in] name
/// The name of the function, as used in the text.
UtilityFunction(ExecutionContextScope &exe_scope, std::string text,
std::string name);
~UtilityFunction() override;
/// Install the utility function into a process
///
/// \param[in] diagnostic_manager
/// A diagnostic manager to print parse errors and warnings to.
///
/// \param[in] exe_ctx
/// The execution context to install the utility function to.
///
/// \return
/// True on success (no errors); false otherwise.
virtual bool Install(DiagnosticManager &diagnostic_manager,
ExecutionContext &exe_ctx) = 0;
/// Check whether the given address is inside the function
///
/// Especially useful if the function dereferences nullptr to indicate a
/// failed assert.
///
/// \param[in] address
/// The address to check.
///
/// \return
/// True if the address falls within the function's bounds;
/// false if not (or the function is not JIT compiled)
bool ContainsAddress(lldb::addr_t address) {
// nothing is both >= LLDB_INVALID_ADDRESS and < LLDB_INVALID_ADDRESS, so
// this always returns false if the function is not JIT compiled yet
return (address >= m_jit_start_addr && address < m_jit_end_addr);
}
/// Return the string that the parser should parse. Must be a full
/// translation unit.
const char *Text() override { return m_function_text.c_str(); }
/// Return the function name that should be used for executing the
/// expression. Text() should contain the definition of this function.
const char *FunctionName() override { return m_function_name.c_str(); }
/// Return the object that the parser should use when registering local
/// variables. May be nullptr if the Expression doesn't care.
ExpressionVariableList *LocalVariables() { return nullptr; }
/// Return true if validation code should be inserted into the expression.
bool NeedsValidation() override { return false; }
/// Return true if external variables in the expression should be resolved.
bool NeedsVariableResolution() override { return false; }
// This makes the function caller function. Pass in the ThreadSP if you have
// one available, compilation can end up calling code (e.g. to look up
// indirect functions) and we don't want this to wander onto another thread.
FunctionCaller *MakeFunctionCaller(const CompilerType &return_type,
const ValueList &arg_value_list,
lldb::ThreadSP compilation_thread,
Status &error);
// This one retrieves the function caller that is already made. If you
// haven't made it yet, this returns nullptr
FunctionCaller *GetFunctionCaller() { return m_caller_up.get(); }
protected:
std::shared_ptr<IRExecutionUnit> m_execution_unit_sp;
lldb::ModuleWP m_jit_module_wp;
/// The text of the function. Must be a well-formed translation unit.
std::string m_function_text;
/// The name of the function.
std::string m_function_name;
std::unique_ptr<FunctionCaller> m_caller_up;
};
} // namespace lldb_private
#endif // LLDB_EXPRESSION_UTILITYFUNCTION_H
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