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//===-- LLVMUserExpression.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_LLVMUserExpression_h
#define liblldb_LLVMUserExpression_h
#include <map>
#include <string>
#include <vector>
#include "llvm/IR/LegacyPassManager.h"
#include "lldb/Expression/UserExpression.h"
namespace lldb_private {
/// \class LLVMUserExpression LLVMUserExpression.h
/// "lldb/Expression/LLVMUserExpression.h" 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 {
// LLVM RTTI support
static char ID;
public:
bool isA(const void *ClassID) const override {
return ClassID == &ID || UserExpression::isA(ClassID);
}
static bool classof(const Expression *obj) { return obj->isA(&ID); }
// 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, llvm::StringRef expr,
llvm::StringRef 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; }
Materializer *GetMaterializer() override { return m_materializer_up.get(); }
/// 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::Status &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_up; ///< The materializer to use
/// when running the
/// expression.
lldb::ModuleWP m_jit_module_wp;
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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