| //===-- ClangExpressionDeclMap.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_ClangExpressionDeclMap_h_ |
| #define liblldb_ClangExpressionDeclMap_h_ |
| |
| // C Includes |
| #include <signal.h> |
| #include <stdint.h> |
| |
| // C++ Includes |
| #include <vector> |
| |
| #include "ClangASTSource.h" |
| #include "ClangExpressionVariable.h" |
| |
| // Other libraries and framework includes |
| // Project includes |
| #include "lldb/Core/ClangForward.h" |
| #include "lldb/Core/Value.h" |
| #include "lldb/Expression/Materializer.h" |
| #include "lldb/Symbol/SymbolContext.h" |
| #include "lldb/Symbol/TaggedASTType.h" |
| #include "lldb/Target/ExecutionContext.h" |
| #include "lldb/lldb-public.h" |
| #include "clang/AST/Decl.h" |
| #include "llvm/ADT/DenseMap.h" |
| |
| namespace lldb_private { |
| |
| //---------------------------------------------------------------------- |
| /// @class ClangExpressionDeclMap ClangExpressionDeclMap.h |
| /// "lldb/Expression/ClangExpressionDeclMap.h" Manages named entities that are |
| /// defined in LLDB's debug information. |
| /// |
| /// The Clang parser uses the ClangASTSource as an interface to request named |
| /// entities from outside an expression. The ClangASTSource reports back, |
| /// listing all possible objects corresponding to a particular name. But it |
| /// in turn relies on ClangExpressionDeclMap, which performs several important |
| /// functions. |
| /// |
| /// First, it records what variables and functions were looked up and what |
| /// Decls were returned for them. |
| /// |
| /// Second, it constructs a struct on behalf of IRForTarget, recording which |
| /// variables should be placed where and relaying this information back so |
| /// that IRForTarget can generate context-independent code. |
| /// |
| /// Third, it "materializes" this struct on behalf of the expression command, |
| /// finding the current values of each variable and placing them into the |
| /// struct so that it can be passed to the JITted version of the IR. |
| /// |
| /// Fourth and finally, it "dematerializes" the struct after the JITted code |
| /// has has executed, placing the new values back where it found the old ones. |
| //---------------------------------------------------------------------- |
| class ClangExpressionDeclMap : public ClangASTSource { |
| public: |
| //------------------------------------------------------------------ |
| /// Constructor |
| /// |
| /// Initializes class variables. |
| /// |
| /// @param[in] keep_result_in_memory |
| /// If true, inhibits the normal deallocation of the memory for |
| /// the result persistent variable, and instead marks the variable |
| /// as persisting. |
| /// |
| /// @param[in] delegate |
| /// If non-NULL, use this delegate to report result values. This |
| /// allows the client ClangUserExpression to report a result. |
| /// |
| /// @param[in] exe_ctx |
| /// The execution context to use when parsing. |
| //------------------------------------------------------------------ |
| ClangExpressionDeclMap( |
| bool keep_result_in_memory, |
| Materializer::PersistentVariableDelegate *result_delegate, |
| ExecutionContext &exe_ctx); |
| |
| //------------------------------------------------------------------ |
| /// Destructor |
| //------------------------------------------------------------------ |
| ~ClangExpressionDeclMap() override; |
| |
| //------------------------------------------------------------------ |
| /// Enable the state needed for parsing and IR transformation. |
| /// |
| /// @param[in] exe_ctx |
| /// The execution context to use when finding types for variables. |
| /// Also used to find a "scratch" AST context to store result types. |
| /// |
| /// @param[in] materializer |
| /// If non-NULL, the materializer to populate with information about |
| /// the variables to use |
| /// |
| /// @return |
| /// True if parsing is possible; false if it is unsafe to continue. |
| //------------------------------------------------------------------ |
| bool WillParse(ExecutionContext &exe_ctx, Materializer *materializer); |
| |
| void InstallCodeGenerator(clang::ASTConsumer *code_gen); |
| |
| //------------------------------------------------------------------ |
| /// [Used by ClangExpressionParser] For each variable that had an unknown |
| /// type at the beginning of parsing, determine its final type now. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool ResolveUnknownTypes(); |
| |
| //------------------------------------------------------------------ |
| /// Disable the state needed for parsing and IR transformation. |
| //------------------------------------------------------------------ |
| void DidParse(); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Add a variable to the list of persistent |
| /// variables for the process. |
| /// |
| /// @param[in] decl |
| /// The Clang declaration for the persistent variable, used for |
| /// lookup during parsing. |
| /// |
| /// @param[in] name |
| /// The name of the persistent variable, usually $something. |
| /// |
| /// @param[in] type |
| /// The type of the variable, in the Clang parser's context. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool AddPersistentVariable(const clang::NamedDecl *decl, |
| const ConstString &name, TypeFromParser type, |
| bool is_result, bool is_lvalue); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Add a variable to the struct that needs to |
| /// be materialized each time the expression runs. |
| /// |
| /// @param[in] decl |
| /// The Clang declaration for the variable. |
| /// |
| /// @param[in] name |
| /// The name of the variable. |
| /// |
| /// @param[in] value |
| /// The LLVM IR value for this variable. |
| /// |
| /// @param[in] size |
| /// The size of the variable in bytes. |
| /// |
| /// @param[in] alignment |
| /// The required alignment of the variable in bytes. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool AddValueToStruct(const clang::NamedDecl *decl, const ConstString &name, |
| llvm::Value *value, size_t size, |
| lldb::offset_t alignment); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Finalize the struct, laying out the position of |
| /// each object in it. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| bool DoStructLayout(); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get general information about the laid-out struct |
| /// after DoStructLayout() has been called. |
| /// |
| /// @param[out] num_elements |
| /// The number of elements in the struct. |
| /// |
| /// @param[out] size |
| /// The size of the struct, in bytes. |
| /// |
| /// @param[out] alignment |
| /// The alignment of the struct, in bytes. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool GetStructInfo(uint32_t &num_elements, size_t &size, |
| lldb::offset_t &alignment); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get specific information about one field of the |
| /// laid-out struct after DoStructLayout() has been called. |
| /// |
| /// @param[out] decl |
| /// The parsed Decl for the field, as generated by ClangASTSource |
| /// on ClangExpressionDeclMap's behalf. In the case of the result |
| /// value, this will have the name $__lldb_result even if the |
| /// result value ends up having the name $1. This is an |
| /// implementation detail of IRForTarget. |
| /// |
| /// @param[out] value |
| /// The IR value for the field (usually a GlobalVariable). In |
| /// the case of the result value, this will have the correct |
| /// name ($1, for instance). This is an implementation detail |
| /// of IRForTarget. |
| /// |
| /// @param[out] offset |
| /// The offset of the field from the beginning of the struct. |
| /// As long as the struct is aligned according to its required |
| /// alignment, this offset will align the field correctly. |
| /// |
| /// @param[out] name |
| /// The name of the field as used in materialization. |
| /// |
| /// @param[in] index |
| /// The index of the field about which information is requested. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool GetStructElement(const clang::NamedDecl *&decl, llvm::Value *&value, |
| lldb::offset_t &offset, ConstString &name, |
| uint32_t index); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get information about a function given its Decl. |
| /// |
| /// @param[in] decl |
| /// The parsed Decl for the Function, as generated by ClangASTSource |
| /// on ClangExpressionDeclMap's behalf. |
| /// |
| /// @param[out] ptr |
| /// The absolute address of the function in the target. |
| /// |
| /// @return |
| /// True if the information could be retrieved; false otherwise. |
| //------------------------------------------------------------------ |
| bool GetFunctionInfo(const clang::NamedDecl *decl, uint64_t &ptr); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRForTarget] Get the address of a symbol given nothing but its |
| /// name. |
| /// |
| /// @param[in] target |
| /// The target to find the symbol in. If not provided, |
| /// then the current parsing context's Target. |
| /// |
| /// @param[in] process |
| /// The process to use. For Objective-C symbols, the process's |
| /// Objective-C language runtime may be queried if the process |
| /// is non-NULL. |
| /// |
| /// @param[in] name |
| /// The name of the symbol. |
| /// |
| /// @param[in] module |
| /// The module to limit the search to. This can be NULL |
| /// |
| /// @return |
| /// Valid load address for the symbol |
| //------------------------------------------------------------------ |
| lldb::addr_t GetSymbolAddress(Target &target, Process *process, |
| const ConstString &name, |
| lldb::SymbolType symbol_type, |
| Module *module = NULL); |
| |
| lldb::addr_t GetSymbolAddress(const ConstString &name, |
| lldb::SymbolType symbol_type); |
| |
| //------------------------------------------------------------------ |
| /// [Used by IRInterpreter] Get basic target information. |
| /// |
| /// @param[out] byte_order |
| /// The byte order of the target. |
| /// |
| /// @param[out] address_byte_size |
| /// The size of a pointer in bytes. |
| /// |
| /// @return |
| /// True if the information could be determined; false |
| /// otherwise. |
| //------------------------------------------------------------------ |
| struct TargetInfo { |
| lldb::ByteOrder byte_order; |
| size_t address_byte_size; |
| |
| TargetInfo() : byte_order(lldb::eByteOrderInvalid), address_byte_size(0) {} |
| |
| bool IsValid() { |
| return (byte_order != lldb::eByteOrderInvalid && address_byte_size != 0); |
| } |
| }; |
| TargetInfo GetTargetInfo(); |
| |
| //------------------------------------------------------------------ |
| /// [Used by ClangASTSource] Find all entities matching a given name, using |
| /// a NameSearchContext to make Decls for them. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext that can construct Decls for this name. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| void FindExternalVisibleDecls(NameSearchContext &context) override; |
| |
| //------------------------------------------------------------------ |
| /// Find all entities matching a given name in a given module/namespace, |
| /// using a NameSearchContext to make Decls for them. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext that can construct Decls for this name. |
| /// |
| /// @param[in] module |
| /// If non-NULL, the module to query. |
| /// |
| /// @param[in] namespace_decl |
| /// If valid and module is non-NULL, the parent namespace. |
| /// |
| /// @param[in] name |
| /// The name as a plain C string. The NameSearchContext contains |
| /// a DeclarationName for the name so at first the name may seem |
| /// redundant, but ClangExpressionDeclMap operates in RTTI land so |
| /// it can't access DeclarationName. |
| /// |
| /// @param[in] current_id |
| /// The ID for the current FindExternalVisibleDecls invocation, |
| /// for logging purposes. |
| /// |
| /// @return |
| /// True on success; false otherwise. |
| //------------------------------------------------------------------ |
| void FindExternalVisibleDecls(NameSearchContext &context, |
| lldb::ModuleSP module, |
| CompilerDeclContext &namespace_decl, |
| unsigned int current_id); |
| |
| private: |
| ExpressionVariableList |
| m_found_entities; ///< All entities that were looked up for the parser. |
| ExpressionVariableList |
| m_struct_members; ///< All entities that need to be placed in the struct. |
| bool m_keep_result_in_memory; ///< True if result persistent variables |
| ///generated by this expression should stay in |
| ///memory. |
| Materializer::PersistentVariableDelegate |
| *m_result_delegate; ///< If non-NULL, used to report expression results to |
| ///ClangUserExpression. |
| |
| //---------------------------------------------------------------------- |
| /// The following values should not live beyond parsing |
| //---------------------------------------------------------------------- |
| class ParserVars { |
| public: |
| ParserVars() {} |
| |
| Target *GetTarget() { |
| if (m_exe_ctx.GetTargetPtr()) |
| return m_exe_ctx.GetTargetPtr(); |
| else if (m_sym_ctx.target_sp) |
| m_sym_ctx.target_sp.get(); |
| return NULL; |
| } |
| |
| ExecutionContext m_exe_ctx; ///< The execution context to use when parsing. |
| SymbolContext m_sym_ctx; ///< The symbol context to use in finding variables |
| ///and types. |
| ClangPersistentVariables *m_persistent_vars = |
| nullptr; ///< The persistent variables for the process. |
| bool m_enable_lookups = false; ///< Set to true during parsing if we have |
| ///found the first "$__lldb" name. |
| TargetInfo m_target_info; ///< Basic information about the target. |
| Materializer *m_materializer = nullptr; ///< If non-NULL, the materializer |
| ///to use when reporting used |
| ///variables. |
| clang::ASTConsumer *m_code_gen = nullptr; ///< If non-NULL, a code generator |
| ///that receives new top-level |
| ///functions. |
| private: |
| DISALLOW_COPY_AND_ASSIGN(ParserVars); |
| }; |
| |
| std::unique_ptr<ParserVars> m_parser_vars; |
| |
| //---------------------------------------------------------------------- |
| /// Activate parser-specific variables |
| //---------------------------------------------------------------------- |
| void EnableParserVars() { |
| if (!m_parser_vars.get()) |
| m_parser_vars = llvm::make_unique<ParserVars>(); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// Deallocate parser-specific variables |
| //---------------------------------------------------------------------- |
| void DisableParserVars() { m_parser_vars.reset(); } |
| |
| //---------------------------------------------------------------------- |
| /// The following values contain layout information for the materialized |
| /// struct, but are not specific to a single materialization |
| //---------------------------------------------------------------------- |
| struct StructVars { |
| StructVars() |
| : m_struct_alignment(0), m_struct_size(0), m_struct_laid_out(false), |
| m_result_name(), m_object_pointer_type(NULL, NULL) {} |
| |
| lldb::offset_t |
| m_struct_alignment; ///< The alignment of the struct in bytes. |
| size_t m_struct_size; ///< The size of the struct in bytes. |
| bool m_struct_laid_out; ///< True if the struct has been laid out and the |
| ///layout is valid (that is, no new fields have been |
| ///added since). |
| ConstString |
| m_result_name; ///< The name of the result variable ($1, for example) |
| TypeFromUser m_object_pointer_type; ///< The type of the "this" variable, if |
| ///one exists |
| }; |
| |
| std::unique_ptr<StructVars> m_struct_vars; |
| |
| //---------------------------------------------------------------------- |
| /// Activate struct variables |
| //---------------------------------------------------------------------- |
| void EnableStructVars() { |
| if (!m_struct_vars.get()) |
| m_struct_vars.reset(new struct StructVars); |
| } |
| |
| //---------------------------------------------------------------------- |
| /// Deallocate struct variables |
| //---------------------------------------------------------------------- |
| void DisableStructVars() { m_struct_vars.reset(); } |
| |
| //---------------------------------------------------------------------- |
| /// Get this parser's ID for use in extracting parser- and JIT-specific data |
| /// from persistent variables. |
| //---------------------------------------------------------------------- |
| uint64_t GetParserID() { return (uint64_t) this; } |
| |
| //------------------------------------------------------------------ |
| /// Given a target, find a variable that matches the given name and type. |
| /// |
| /// @param[in] target |
| /// The target to use as a basis for finding the variable. |
| /// |
| /// @param[in] module |
| /// If non-NULL, the module to search. |
| /// |
| /// @param[in] name |
| /// The name as a plain C string. |
| /// |
| /// @param[in] namespace_decl |
| /// If non-NULL and module is non-NULL, the parent namespace. |
| /// |
| /// @param[in] type |
| /// The required type for the variable. This function may be called |
| /// during parsing, in which case we don't know its type; hence the |
| /// default. |
| /// |
| /// @return |
| /// The LLDB Variable found, or NULL if none was found. |
| //------------------------------------------------------------------ |
| lldb::VariableSP FindGlobalVariable(Target &target, lldb::ModuleSP &module, |
| const ConstString &name, |
| CompilerDeclContext *namespace_decl, |
| TypeFromUser *type = NULL); |
| |
| //------------------------------------------------------------------ |
| /// Get the value of a variable in a given execution context and return the |
| /// associated Types if needed. |
| /// |
| /// @param[in] var |
| /// The variable to evaluate. |
| /// |
| /// @param[out] var_location |
| /// The variable location value to fill in |
| /// |
| /// @param[out] found_type |
| /// The type of the found value, as it was found in the user process. |
| /// This is only useful when the variable is being inspected on behalf |
| /// of the parser, hence the default. |
| /// |
| /// @param[out] parser_type |
| /// The type of the found value, as it was copied into the parser's |
| /// AST context. This is only useful when the variable is being |
| /// inspected on behalf of the parser, hence the default. |
| /// |
| /// @param[in] decl |
| /// The Decl to be looked up. |
| /// |
| /// @return |
| /// Return true if the value was successfully filled in. |
| //------------------------------------------------------------------ |
| bool GetVariableValue(lldb::VariableSP &var, |
| lldb_private::Value &var_location, |
| TypeFromUser *found_type = NULL, |
| TypeFromParser *parser_type = NULL); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given LLDB |
| /// Variable, and put it in the Tuple list. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] var |
| /// The LLDB Variable that needs a Decl. |
| /// |
| /// @param[in] valobj |
| /// The LLDB ValueObject for that variable. |
| //------------------------------------------------------------------ |
| void AddOneVariable(NameSearchContext &context, lldb::VariableSP var, |
| lldb::ValueObjectSP valobj, unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given persistent |
| /// variable, and put it in the list of found entities. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] pvar |
| /// The persistent variable that needs a Decl. |
| /// |
| /// @param[in] current_id |
| /// The ID of the current invocation of FindExternalVisibleDecls |
| /// for logging purposes. |
| //------------------------------------------------------------------ |
| void AddOneVariable(NameSearchContext &context, |
| lldb::ExpressionVariableSP &pvar_sp, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given LLDB symbol |
| /// (treated as a variable), and put it in the list of found entities. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] var |
| /// The LLDB Variable that needs a Decl. |
| //------------------------------------------------------------------ |
| void AddOneGenericVariable(NameSearchContext &context, const Symbol &symbol, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given function. |
| /// (Functions are not placed in the Tuple list.) Can handle both fully |
| /// typed functions and generic functions. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] fun |
| /// The Function that needs to be created. If non-NULL, this is |
| /// a fully-typed function. |
| /// |
| /// @param[in] sym |
| /// The Symbol that corresponds to a function that needs to be |
| /// created with generic type (unitptr_t foo(...)). |
| //------------------------------------------------------------------ |
| void AddOneFunction(NameSearchContext &context, Function *fun, Symbol *sym, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given register. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] reg_info |
| /// The information corresponding to that register. |
| //------------------------------------------------------------------ |
| void AddOneRegister(NameSearchContext &context, const RegisterInfo *reg_info, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Use the NameSearchContext to generate a Decl for the given type. (Types |
| /// are not placed in the Tuple list.) |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] type |
| /// The type that needs to be created. |
| //------------------------------------------------------------------ |
| void AddOneType(NameSearchContext &context, TypeFromUser &type, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Generate a Decl for "*this" and add a member function declaration to it |
| /// for the expression, then report it. |
| /// |
| /// @param[in] context |
| /// The NameSearchContext to use when constructing the Decl. |
| /// |
| /// @param[in] type |
| /// The type for *this. |
| //------------------------------------------------------------------ |
| void AddThisType(NameSearchContext &context, TypeFromUser &type, |
| unsigned int current_id); |
| |
| //------------------------------------------------------------------ |
| /// Move a type out of the current ASTContext into another, but make sure to |
| /// export all components of the type also. |
| /// |
| /// @param[in] target |
| /// The ClangASTContext to move to. |
| /// @param[in] source |
| /// The ClangASTContext to move from. This is assumed to be going away. |
| /// @param[in] parser_type |
| /// The type as it appears in the source context. |
| /// |
| /// @return |
| /// Returns the moved type, or an empty type if there was a problem. |
| //------------------------------------------------------------------ |
| TypeFromUser DeportType(ClangASTContext &target, ClangASTContext &source, |
| TypeFromParser parser_type); |
| |
| ClangASTContext *GetClangASTContext(); |
| }; |
| |
| } // namespace lldb_private |
| |
| #endif // liblldb_ClangExpressionDeclMap_h_ |
