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//===-- ClangUserExpression.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_ClangUserExpression_h_
#define liblldb_ClangUserExpression_h_
// C Includes
// C++ Includes
#include <vector>
// Other libraries and framework includes
// Project includes
#include "ASTStructExtractor.h"
#include "ASTResultSynthesizer.h"
#include "ClangExpressionDeclMap.h"
#include "ClangExpressionHelper.h"
#include "ClangExpressionVariable.h"
#include "IRForTarget.h"
#include "lldb/lldb-forward.h"
#include "lldb/lldb-private.h"
#include "lldb/Core/Address.h"
#include "lldb/Core/ClangForward.h"
#include "lldb/Expression/LLVMUserExpression.h"
#include "lldb/Expression/Materializer.h"
#include "lldb/Target/ExecutionContext.h"
namespace lldb_private
{
//----------------------------------------------------------------------
/// @class ClangUserExpression ClangUserExpression.h "lldb/Expression/ClangUserExpression.h"
/// @brief Encapsulates a single expression for use with Clang
///
/// LLDB uses expressions for various purposes, notably to call functions
/// and as a backend for the expr command. ClangUserExpression encapsulates
/// the objects needed to parse and interpret or JIT an expression. It
/// uses the Clang parser to produce LLVM IR from the expression.
//----------------------------------------------------------------------
class ClangUserExpression : public LLVMUserExpression
{
public:
enum { kDefaultTimeout = 500000u };
class ClangUserExpressionHelper : public ClangExpressionHelper
{
public:
ClangUserExpressionHelper (Target &target) :
m_target(target)
{
}
~ClangUserExpressionHelper() override = default;
//------------------------------------------------------------------
/// Return the object that the parser should use when resolving external
/// values. May be NULL if everything should be self-contained.
//------------------------------------------------------------------
ClangExpressionDeclMap *
DeclMap() override
{
return m_expr_decl_map_up.get();
}
void
ResetDeclMap()
{
m_expr_decl_map_up.reset();
}
void
ResetDeclMap (ExecutionContext & exe_ctx, Materializer::PersistentVariableDelegate &result_delegate, bool keep_result_in_memory);
//------------------------------------------------------------------
/// Return the object that the parser should allow to access ASTs.
/// May be NULL if the ASTs do not need to be transformed.
///
/// @param[in] passthrough
/// The ASTConsumer that the returned transformer should send
/// the ASTs to after transformation.
//------------------------------------------------------------------
clang::ASTConsumer *
ASTTransformer(clang::ASTConsumer *passthrough) override;
private:
Target &m_target;
std::unique_ptr<ClangExpressionDeclMap> m_expr_decl_map_up;
std::unique_ptr<ASTStructExtractor> m_struct_extractor_up; ///< The class that generates the argument struct layout.
std::unique_ptr<ASTResultSynthesizer> m_result_synthesizer_up;
};
//------------------------------------------------------------------
/// Constructor
///
/// @param[in] expr
/// The expression to parse.
///
/// @param[in] expr_prefix
/// If non-NULL, a C string containing translation-unit level
/// definitions to be included when the expression is parsed.
///
/// @param[in] language
/// If not eLanguageTypeUnknown, a language to use when parsing
/// the expression. Currently restricted to those languages
/// supported by Clang.
///
/// @param[in] desired_type
/// If not eResultTypeAny, the type to use for the expression
/// result.
//------------------------------------------------------------------
ClangUserExpression (ExecutionContextScope &exe_scope,
const char *expr,
const char *expr_prefix,
lldb::LanguageType language,
ResultType desired_type,
const EvaluateExpressionOptions &options);
~ClangUserExpression() override;
//------------------------------------------------------------------
/// Parse the expression
///
/// @param[in] error_stream
/// A stream to print parse errors and warnings to.
///
/// @param[in] exe_ctx
/// The execution context to use when looking up entities that
/// are needed for parsing (locations of functions, types of
/// variables, persistent variables, etc.)
///
/// @param[in] execution_policy
/// Determines whether interpretation is possible or mandatory.
///
/// @param[in] keep_result_in_memory
/// True if the resulting persistent variable should reside in
/// target memory, if applicable.
///
/// @return
/// True on success (no errors); false otherwise.
//------------------------------------------------------------------
bool
Parse (Stream &error_stream,
ExecutionContext &exe_ctx,
lldb_private::ExecutionPolicy execution_policy,
bool keep_result_in_memory,
bool generate_debug_info) override;
ExpressionTypeSystemHelper *
GetTypeSystemHelper () override
{
return &m_type_system_helper;
}
ClangExpressionDeclMap *
DeclMap ()
{
return m_type_system_helper.DeclMap();
}
void
ResetDeclMap ()
{
m_type_system_helper.ResetDeclMap();
}
void
ResetDeclMap (ExecutionContext & exe_ctx, Materializer::PersistentVariableDelegate &result_delegate, bool keep_result_in_memory)
{
m_type_system_helper.ResetDeclMap(exe_ctx, result_delegate, keep_result_in_memory);
}
lldb::ExpressionVariableSP
GetResultAfterDematerialization(ExecutionContextScope *exe_scope) override;
private:
//------------------------------------------------------------------
/// Populate m_in_cplusplus_method and m_in_objectivec_method based on the environment.
//------------------------------------------------------------------
void
ScanContext (ExecutionContext &exe_ctx,
lldb_private::Error &err) override;
bool
AddArguments (ExecutionContext &exe_ctx,
std::vector<lldb::addr_t> &args,
lldb::addr_t struct_address,
Stream &error_stream) override;
ClangUserExpressionHelper m_type_system_helper;
class ResultDelegate : public Materializer::PersistentVariableDelegate
{
public:
ResultDelegate();
ConstString GetName() override;
void DidDematerialize(lldb::ExpressionVariableSP &variable) override;
void RegisterPersistentState(PersistentExpressionState *persistent_state);
lldb::ExpressionVariableSP &GetVariable();
private:
PersistentExpressionState *m_persistent_state;
lldb::ExpressionVariableSP m_variable;
};
ResultDelegate m_result_delegate;
};
} // namespace lldb_private
#endif // liblldb_ClangUserExpression_h_
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