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//===-- LLVMUserExpression.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_LLVMUserExpression_h
#define liblldb_LLVMUserExpression_h
// C Includes
// C++ Includes
#include <string>
#include <map>
#include <vector>
// Other libraries and framework includes
#include "llvm/IR/LegacyPassManager.h"
// Project includes
#include "lldb/Expression/UserExpression.h"
namespace lldb_private
{
//----------------------------------------------------------------------
/// @class LLVMUserExpression LLVMUserExpression.h "lldb/Expression/LLVMUserExpression.h"
/// @brief Encapsulates a one-time expression for use in lldb.
///
/// LLDB uses expressions for various purposes, notably to call functions
/// and as a backend for the expr command. LLVMUserExpression is a virtual base
/// class that encapsulates the objects needed to parse and JIT an expression.
/// The actual parsing part will be provided by the specific implementations
/// of LLVMUserExpression - which will be vended through the appropriate TypeSystem.
//----------------------------------------------------------------------
class LLVMUserExpression : public UserExpression
{
public:
// The IRPasses struct is filled in by a runtime after an expression is compiled and can be used to to run
// fixups/analysis passes as required. EarlyPasses are run on the generated module before lldb runs its own IR
// fixups and inserts instrumentation code/pointer checks. LatePasses are run after the module has been processed by
// llvm, before the module is assembled and run in the ThreadPlan.
struct IRPasses
{
IRPasses() : EarlyPasses(nullptr), LatePasses(nullptr){};
std::shared_ptr<llvm::legacy::PassManager> EarlyPasses;
std::shared_ptr<llvm::legacy::PassManager> LatePasses;
};
LLVMUserExpression(ExecutionContextScope &exe_scope, const char *expr, const char *expr_prefix,
lldb::LanguageType language, ResultType desired_type,
const EvaluateExpressionOptions &options);
~LLVMUserExpression() override;
bool
FinalizeJITExecution(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
lldb::ExpressionVariableSP &result,
lldb::addr_t function_stack_bottom = LLDB_INVALID_ADDRESS,
lldb::addr_t function_stack_top = LLDB_INVALID_ADDRESS) override;
bool
CanInterpret() override
{
return m_can_interpret;
}
//------------------------------------------------------------------
/// Return the string that the parser should parse. Must be a full
/// translation unit.
//------------------------------------------------------------------
const char *
Text() override
{
return m_transformed_text.c_str();
}
lldb::ModuleSP GetJITModule() override;
protected:
lldb::ExpressionResults
DoExecute(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
const EvaluateExpressionOptions &options, lldb::UserExpressionSP &shared_ptr_to_me,
lldb::ExpressionVariableSP &result) override;
virtual void
ScanContext(ExecutionContext &exe_ctx, lldb_private::Error &err) = 0;
bool
PrepareToExecuteJITExpression(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
lldb::addr_t &struct_address);
virtual bool
AddArguments(ExecutionContext &exe_ctx, std::vector<lldb::addr_t> &args, lldb::addr_t struct_address,
DiagnosticManager &diagnostic_manager) = 0;
lldb::addr_t m_stack_frame_bottom; ///< The bottom of the allocated stack frame.
lldb::addr_t m_stack_frame_top; ///< The top of the allocated stack frame.
bool m_allow_cxx; ///< True if the language allows C++.
bool m_allow_objc; ///< True if the language allows Objective-C.
std::string m_transformed_text; ///< The text of the expression, as send to the parser
std::shared_ptr<IRExecutionUnit> m_execution_unit_sp; ///< The execution unit the expression is stored in.
std::unique_ptr<Materializer> m_materializer_ap; ///< The materializer to use when running the expression.
lldb::ModuleWP m_jit_module_wp;
bool m_enforce_valid_object; ///< True if the expression parser should enforce the presence of a valid class pointer
///in order to generate the expression as a method.
bool m_in_cplusplus_method; ///< True if the expression is compiled as a C++ member function (true if it was parsed
///when exe_ctx was in a C++ method).
bool m_in_objectivec_method; ///< True if the expression is compiled as an Objective-C method (true if it was parsed
///when exe_ctx was in an Objective-C method).
bool m_in_static_method; ///< True if the expression is compiled as a static (or class) method (currently true if it
///was parsed when exe_ctx was in an Objective-C class method).
bool m_needs_object_ptr; ///< True if "this" or "self" must be looked up and passed in. False if the expression
///doesn't really use them and they can be NULL.
bool m_const_object; ///< True if "this" is const.
Target *m_target; ///< The target for storing persistent data like types and variables.
bool m_can_interpret; ///< True if the expression could be evaluated statically; false otherwise.
lldb::addr_t
m_materialized_address; ///< The address at which the arguments to the expression have been materialized.
Materializer::DematerializerSP m_dematerializer_sp; ///< The dematerializer.
};
} // namespace lldb_private
#endif
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