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/lldb-public.h"
14 #include "lldb/Core/ArchSpec.h"
15 #include "lldb/Core/ClangForward.h"
16 #include "lldb/Core/Error.h"
17 #include "lldb/Expression/IRForTarget.h"
22 namespace lldb_private
25 class IRExecutionUnit;
27 //----------------------------------------------------------------------
28 /// @class ClangExpressionParser ClangExpressionParser.h "lldb/Expression/ClangExpressionParser.h"
29 /// @brief Encapsulates an instance of Clang that can parse expressions.
31 /// ClangExpressionParser is responsible for preparing an instance of
32 /// ClangExpression for execution. ClangExpressionParser uses ClangExpression
33 /// as a glorified parameter list, performing the required parsing and
34 /// conversion to formats (DWARF bytecode, or JIT compiled machine code)
35 /// that can be executed.
36 //----------------------------------------------------------------------
37 class ClangExpressionParser
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,
54 ClangExpression &expr,
55 bool generate_debug_info);
57 //------------------------------------------------------------------
59 //------------------------------------------------------------------
60 ~ClangExpressionParser ();
62 //------------------------------------------------------------------
63 /// Parse a single expression and convert it to IR using Clang. Don't
64 /// wrap the expression in anything at all.
67 /// The stream to print errors to.
70 /// The number of errors encountered during parsing. 0 means
72 //------------------------------------------------------------------
74 Parse (Stream &stream);
76 //------------------------------------------------------------------
77 /// Ready an already-parsed expression for execution, possibly
78 /// evaluating it statically.
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,
115 lldb::addr_t &func_end,
116 std::shared_ptr<IRExecutionUnit> &execution_unit_sp,
117 ExecutionContext &exe_ctx,
119 lldb_private::ExecutionPolicy execution_policy);
121 //------------------------------------------------------------------
122 /// Disassemble the machine code for a JITted function from the target
123 /// process's memory and print the result to a stream.
125 /// @param[in] stream
126 /// The stream to print disassembly to.
128 /// @param[in] exc_context
129 /// The execution context to get the machine code from.
132 /// The error generated. If .Success() is true, disassembly succeeded.
133 //------------------------------------------------------------------
135 DisassembleFunction (Stream &stream,
136 ExecutionContext &exe_ctx);
139 GetGenerateDebugInfo () const;
142 ClangExpression & m_expr; ///< The expression to be parsed
143 std::unique_ptr<llvm::LLVMContext> m_llvm_context; ///< The LLVM context to generate IR into
144 std::unique_ptr<clang::FileManager> m_file_manager; ///< The Clang file manager object used by the compiler
145 std::unique_ptr<clang::CompilerInstance> m_compiler; ///< The Clang compiler used to parse expressions into IR
146 std::unique_ptr<clang::Builtin::Context> m_builtin_context; ///< Context for Clang built-ins
147 std::unique_ptr<clang::SelectorTable> m_selector_table; ///< Selector table for Objective-C methods
148 std::unique_ptr<clang::ASTContext> m_ast_context; ///< The AST context used to hold types and names for the parser
149 std::unique_ptr<clang::CodeGenerator> m_code_generator; ///< The Clang object that generates IR
154 #endif // liblldb_ClangExpressionParser_h_