1 //===-- ClangExpressionParser.h ---------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #ifndef liblldb_ClangExpressionParser_h_
10 #define liblldb_ClangExpressionParser_h_
12 #include "lldb/Core/ClangForward.h"
13 #include "lldb/Expression/DiagnosticManager.h"
14 #include "lldb/Expression/ExpressionParser.h"
15 #include "lldb/Utility/ArchSpec.h"
16 #include "lldb/Utility/Status.h"
17 #include "lldb/lldb-public.h"
23 class CodeCompleteConsumer;
26 namespace lldb_private {
28 class IRExecutionUnit;
30 /// \class ClangExpressionParser ClangExpressionParser.h
31 /// "lldb/Expression/ClangExpressionParser.h" Encapsulates an instance of
32 /// Clang that can parse expressions.
34 /// ClangExpressionParser is responsible for preparing an instance of
35 /// ClangExpression for execution. ClangExpressionParser uses ClangExpression
36 /// as a glorified parameter list, performing the required parsing and
37 /// conversion to formats (DWARF bytecode, or JIT compiled machine code) that
39 class ClangExpressionParser : public ExpressionParser {
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.
53 /// @param[in] include_directories
54 /// List of include directories that should be used when parsing the
57 /// @param[in] filename
58 /// Name of the source file that should be used when rendering
59 /// diagnostics (i.e. errors, warnings or notes from Clang).
60 ClangExpressionParser(ExecutionContextScope *exe_scope, Expression &expr,
61 bool generate_debug_info,
62 std::vector<std::string> include_directories = {},
63 std::string filename = "<clang expression>");
66 ~ClangExpressionParser() override;
68 bool Complete(CompletionRequest &request, unsigned line, unsigned pos,
69 unsigned typed_pos) override;
71 /// Parse a single expression and convert it to IR using Clang. Don't wrap
72 /// the expression in anything at all.
74 /// \param[in] diagnostic_manager
75 /// The diagnostic manager to report errors to.
78 /// The number of errors encountered during parsing. 0 means
80 unsigned Parse(DiagnosticManager &diagnostic_manager);
82 bool RewriteExpression(DiagnosticManager &diagnostic_manager) override;
84 /// Ready an already-parsed expression for execution, possibly evaluating it
87 /// \param[out] func_addr
88 /// The address to which the function has been written.
90 /// \param[out] func_end
91 /// The end of the function's allocated memory region. (func_addr
92 /// and func_end do not delimit an allocated region; the allocated
93 /// region may begin before func_addr.)
95 /// \param[in] execution_unit_sp
96 /// After parsing, ownership of the execution unit for
97 /// for the expression is handed to this shared pointer.
99 /// \param[in] exe_ctx
100 /// The execution context to write the function into.
102 /// \param[in] execution_policy
103 /// Determines whether the expression must be JIT-compiled, must be
104 /// evaluated statically, or whether this decision may be made
105 /// opportunistically.
108 /// An error code indicating the success or failure of the operation.
109 /// Test with Success().
111 PrepareForExecution(lldb::addr_t &func_addr, lldb::addr_t &func_end,
112 lldb::IRExecutionUnitSP &execution_unit_sp,
113 ExecutionContext &exe_ctx, bool &can_interpret,
114 lldb_private::ExecutionPolicy execution_policy) override;
116 /// Run all static initializers for an execution unit.
118 /// \param[in] execution_unit_sp
119 /// The execution unit.
121 /// \param[in] exe_ctx
122 /// The execution context to use when running them. Thread can't be null.
125 /// The error code indicating the
126 Status RunStaticInitializers(lldb::IRExecutionUnitSP &execution_unit_sp,
127 ExecutionContext &exe_ctx);
129 /// Returns a string representing current ABI.
131 /// \param[in] target_arch
132 /// The target architecture.
135 /// A string representing target ABI for the current architecture.
136 std::string GetClangTargetABI(const ArchSpec &target_arch);
139 /// Parses the expression.
141 /// \param[in] diagnostic_manager
142 /// The diagnostic manager that should receive the diagnostics
143 /// from the parsing process.
145 /// \param[in] completion
146 /// The completion consumer that should be used during parsing
147 /// (or a nullptr if no consumer should be attached).
149 /// \param[in] completion_line
150 /// The line in which the completion marker should be placed.
151 /// The first line is represented by the value 0.
153 /// \param[in] completion_column
154 /// The column in which the completion marker should be placed.
155 /// The first column is represented by the value 0.
158 /// The number of parsing errors.
159 unsigned ParseInternal(DiagnosticManager &diagnostic_manager,
160 clang::CodeCompleteConsumer *completion = nullptr,
161 unsigned completion_line = 0,
162 unsigned completion_column = 0);
164 std::unique_ptr<llvm::LLVMContext>
165 m_llvm_context; ///< The LLVM context to generate IR into
166 std::unique_ptr<clang::CompilerInstance>
167 m_compiler; ///< The Clang compiler used to parse expressions into IR
168 std::unique_ptr<clang::CodeGenerator>
169 m_code_generator; ///< The Clang object that generates IR
171 class LLDBPreprocessorCallbacks;
172 LLDBPreprocessorCallbacks *m_pp_callbacks; ///< Called when the preprocessor
173 ///encounters module imports
174 std::unique_ptr<ClangASTContext> m_ast_context;
176 std::vector<std::string> m_include_directories;
177 /// File name used for the user expression.
178 std::string m_filename;
182 #endif // liblldb_ClangExpressionParser_h_