1 //===-- ClangExpressionParser.h ---------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_ClangExpressionParser_h_
11 #define liblldb_ClangExpressionParser_h_
13 #include "lldb/Core/ClangForward.h"
14 #include "lldb/Expression/DiagnosticManager.h"
15 #include "lldb/Expression/ExpressionParser.h"
16 #include "lldb/Utility/ArchSpec.h"
17 #include "lldb/Utility/Status.h"
18 #include "lldb/lldb-public.h"
23 namespace lldb_private {
25 class IRExecutionUnit;
27 //----------------------------------------------------------------------
28 /// @class ClangExpressionParser ClangExpressionParser.h
29 /// "lldb/Expression/ClangExpressionParser.h" Encapsulates an instance of
30 /// Clang that can parse expressions.
32 /// ClangExpressionParser is responsible for preparing an instance of
33 /// ClangExpression for execution. ClangExpressionParser uses ClangExpression
34 /// as a glorified parameter list, performing the required parsing and
35 /// conversion to formats (DWARF bytecode, or JIT compiled machine code) that
37 //----------------------------------------------------------------------
38 class ClangExpressionParser : public ExpressionParser {
40 //------------------------------------------------------------------
43 /// Initializes class variables.
45 /// @param[in] exe_scope,
46 /// If non-NULL, an execution context scope that can help to
47 /// correctly create an expression with a valid process for
48 /// optional tuning Objective-C runtime support. Can be NULL.
51 /// The expression to be parsed.
52 //------------------------------------------------------------------
53 ClangExpressionParser(ExecutionContextScope *exe_scope, Expression &expr,
54 bool generate_debug_info);
56 //------------------------------------------------------------------
58 //------------------------------------------------------------------
59 ~ClangExpressionParser() override;
61 //------------------------------------------------------------------
62 /// Parse a single expression and convert it to IR using Clang. Don't wrap
63 /// the expression in anything at all.
65 /// @param[in] diagnostic_manager
66 /// The diagnostic manager to report errors to.
69 /// The number of errors encountered during parsing. 0 means
71 //------------------------------------------------------------------
72 unsigned Parse(DiagnosticManager &diagnostic_manager) override;
74 bool RewriteExpression(DiagnosticManager &diagnostic_manager) override;
76 //------------------------------------------------------------------
77 /// Ready an already-parsed expression for execution, possibly evaluating it
80 /// @param[out] func_addr
81 /// The address to which the function has been written.
83 /// @param[out] func_end
84 /// The end of the function's allocated memory region. (func_addr
85 /// and func_end do not delimit an allocated region; the allocated
86 /// region may begin before func_addr.)
88 /// @param[in] execution_unit_sp
89 /// After parsing, ownership of the execution unit for
90 /// for the expression is handed to this shared pointer.
92 /// @param[in] exe_ctx
93 /// The execution context to write the function into.
95 /// @param[out] evaluated_statically
96 /// Set to true if the expression could be interpreted statically;
97 /// untouched otherwise.
99 /// @param[out] const_result
100 /// If the result of the expression is constant, and the
101 /// expression has no side effects, this is set to the result of the
104 /// @param[in] execution_policy
105 /// Determines whether the expression must be JIT-compiled, must be
106 /// evaluated statically, or whether this decision may be made
107 /// opportunistically.
110 /// An error code indicating the success or failure of the operation.
111 /// Test with Success().
112 //------------------------------------------------------------------
114 PrepareForExecution(lldb::addr_t &func_addr, lldb::addr_t &func_end,
115 lldb::IRExecutionUnitSP &execution_unit_sp,
116 ExecutionContext &exe_ctx, bool &can_interpret,
117 lldb_private::ExecutionPolicy execution_policy) override;
119 //------------------------------------------------------------------
120 /// Run all static initializers for an execution unit.
122 /// @param[in] execution_unit_sp
123 /// The execution unit.
125 /// @param[in] exe_ctx
126 /// The execution context to use when running them. Thread can't be null.
129 /// The error code indicating the
130 //------------------------------------------------------------------
131 Status RunStaticInitializers(lldb::IRExecutionUnitSP &execution_unit_sp,
132 ExecutionContext &exe_ctx);
134 //------------------------------------------------------------------
135 /// Returns a string representing current ABI.
137 /// @param[in] target_arch
138 /// The target architecture.
141 /// A string representing target ABI for the current architecture.
142 //-------------------------------------------------------------------
143 std::string GetClangTargetABI(const ArchSpec &target_arch);
146 std::unique_ptr<llvm::LLVMContext>
147 m_llvm_context; ///< The LLVM context to generate IR into
148 std::unique_ptr<clang::FileManager>
149 m_file_manager; ///< The Clang file manager object used by the compiler
150 std::unique_ptr<clang::CompilerInstance>
151 m_compiler; ///< The Clang compiler used to parse expressions into IR
152 std::unique_ptr<clang::Builtin::Context>
153 m_builtin_context; ///< Context for Clang built-ins
154 std::unique_ptr<clang::SelectorTable>
155 m_selector_table; ///< Selector table for Objective-C methods
156 std::unique_ptr<clang::CodeGenerator>
157 m_code_generator; ///< The Clang object that generates IR
159 class LLDBPreprocessorCallbacks;
160 LLDBPreprocessorCallbacks *m_pp_callbacks; ///< Called when the preprocessor
161 ///encounters module imports
162 std::unique_ptr<ClangASTContext> m_ast_context;
166 #endif // liblldb_ClangExpressionParser_h_