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- /* Source-language-related definitions for GDB.
- Copyright (C) 1991-2022 Free Software Foundation, Inc.
- Contributed by the Department of Computer Science at the State University
- of New York at Buffalo.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #if !defined (LANGUAGE_H)
- #define LANGUAGE_H 1
- #include "symtab.h"
- #include "gdbsupport/function-view.h"
- #include "expression.h"
- /* Forward decls for prototypes. */
- struct value;
- struct objfile;
- struct frame_info;
- struct ui_file;
- struct value_print_options;
- struct type_print_options;
- struct lang_varobj_ops;
- struct parser_state;
- class compile_instance;
- struct completion_match_for_lcd;
- class innermost_block_tracker;
- #define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */
- /* range_check ==
- range_check_on: Ranges are checked in GDB expressions, producing errors.
- range_check_warn: Ranges are checked, producing warnings.
- range_check_off: Ranges are not checked in GDB expressions. */
- extern enum range_check
- {
- range_check_off, range_check_warn, range_check_on
- }
- range_check;
- /* array_ordering ==
- array_row_major: Arrays are in row major order.
- array_column_major: Arrays are in column major order. */
- extern enum array_ordering
- {
- array_row_major, array_column_major
- }
- array_ordering;
- /* case_sensitivity ==
- case_sensitive_on: Case sensitivity in name matching is used.
- case_sensitive_off: Case sensitivity in name matching is not used. */
- extern enum case_sensitivity
- {
- case_sensitive_on, case_sensitive_off
- }
- case_sensitivity;
- /* macro_expansion ==
- macro_expansion_no: No macro expansion is available.
- macro_expansion_c: C-like macro expansion is available. */
- enum macro_expansion
- {
- macro_expansion_no, macro_expansion_c
- };
- /* Per architecture (OS/ABI) language information. */
- struct language_arch_info
- {
- /* A default constructor. */
- language_arch_info () = default;
- DISABLE_COPY_AND_ASSIGN (language_arch_info);
- /* Set the default boolean type to be TYPE. If NAME is not nullptr then
- before using TYPE a symbol called NAME will be looked up, and the type
- of this symbol will be used instead. Should only be called once when
- performing setup for a particular language in combination with a
- particular gdbarch. */
- void set_bool_type (struct type *type, const char *name = nullptr)
- {
- gdb_assert (m_bool_type_default == nullptr);
- gdb_assert (m_bool_type_name == nullptr);
- gdb_assert (type != nullptr);
- m_bool_type_default = type;
- m_bool_type_name = name;
- }
- /* Set the type to be used for characters within a string. Should only
- be called once when performing setup for a particular language in
- combination with a particular gdbarch. */
- void set_string_char_type (struct type *type)
- {
- gdb_assert (m_string_char_type == nullptr);
- gdb_assert (type != nullptr);
- m_string_char_type = type;
- }
- /* Return the type for characters within a string. */
- struct type *string_char_type () const
- { return m_string_char_type; }
- /* Return the type to be used for booleans. */
- struct type *bool_type () const;
- /* Add TYPE to the list of primitive types for this particular language,
- with this OS/ABI combination. */
- void add_primitive_type (struct type *type)
- {
- gdb_assert (type != nullptr);
- primitive_types_and_symbols.push_back (type_and_symbol (type));
- }
- /* Lookup a primitive type called NAME. Will return nullptr if no
- matching type is found. */
- struct type *lookup_primitive_type (const char *name);
- /* Lookup a primitive type for which FILTER returns true. Will return
- nullptr if no matching type is found. */
- struct type *lookup_primitive_type
- (gdb::function_view<bool (struct type *)> filter);
- /* Lookup a primitive type called NAME and return the type as a symbol.
- LANG is the language for which type is being looked up. */
- struct symbol *lookup_primitive_type_as_symbol (const char *name,
- enum language lang);
- private:
- /* A structure storing a type and a corresponding symbol. The type is
- defined at construction time, while the symbol is lazily created only
- when asked for, but is then cached for future use. */
- struct type_and_symbol
- {
- /* Constructor. */
- explicit type_and_symbol (struct type *type)
- : m_type (type)
- { /* Nothing. */ }
- /* Default move constructor. */
- type_and_symbol (type_and_symbol&&) = default;
- DISABLE_COPY_AND_ASSIGN (type_and_symbol);
- /* Return the type from this object. */
- struct type *type () const
- { return m_type; }
- /* Create and return a symbol wrapping M_TYPE from this object. */
- struct symbol *symbol (enum language lang)
- {
- if (m_symbol == nullptr)
- m_symbol = alloc_type_symbol (lang, m_type);
- return m_symbol;
- }
- private:
- /* The type primitive type. */
- struct type *m_type = nullptr;
- /* A symbol wrapping M_TYPE, only created when first asked for. */
- struct symbol *m_symbol = nullptr;
- /* Helper function for type lookup as a symbol. Create the symbol
- corresponding to type TYPE in language LANG. */
- static struct symbol *alloc_type_symbol (enum language lang,
- struct type *type);
- };
- /* Lookup a type_and_symbol entry from the primitive_types_and_symbols
- vector for a type matching NAME. Return a pointer to the
- type_and_symbol object from the vector. This will return nullptr if
- there is no type matching NAME found. */
- type_and_symbol *lookup_primitive_type_and_symbol (const char *name);
- /* Vector of the primitive types added through add_primitive_type. These
- types can be specified by name in parsing types in expressions,
- regardless of whether the program being debugged actually defines such
- a type.
- Within the vector each type is paired with a lazily created symbol,
- which can be fetched by the symbol lookup machinery, should they be
- needed. */
- std::vector<type_and_symbol> primitive_types_and_symbols;
- /* Type of elements of strings. */
- struct type *m_string_char_type = nullptr;
- /* Symbol name of type to use as boolean type, if defined. */
- const char *m_bool_type_name = nullptr;
- /* Otherwise, this is the default boolean builtin type. */
- struct type *m_bool_type_default = nullptr;
- };
- /* In a language (particularly C++) a function argument of an aggregate
- type (i.e. class/struct/union) may be implicitly passed by reference
- even though it is declared a call-by-value argument in the source.
- The struct below puts together necessary information for GDB to be
- able to detect and carry out pass-by-reference semantics for a
- particular type. This type is referred as T in the inlined comments
- below.
- The default values of the fields are chosen to give correct semantics
- for primitive types and for simple aggregate types, such as
- class T {
- int x;
- }; */
- struct language_pass_by_ref_info
- {
- /* True if an argument of type T can be passed to a function by value
- (i.e. not through an implicit reference). False, otherwise. */
- bool trivially_copyable = true;
- /* True if a copy of a value of type T can be initialized by
- memcpy'ing the value bit-by-bit. False, otherwise.
- E.g. If T has a user-defined copy ctor, this should be false. */
- bool trivially_copy_constructible = true;
- /* True if a value of type T can be destructed simply by reclaiming
- the memory area occupied by the value. False, otherwise.
- E.g. If T has a user-defined destructor, this should be false. */
- bool trivially_destructible = true;
- /* True if it is allowed to create a copy of a value of type T.
- False, otherwise.
- E.g. If T has a deleted copy ctor, this should be false. */
- bool copy_constructible = true;
- /* True if a value of type T can be destructed. False, otherwise.
- E.g. If T has a deleted destructor, this should be false. */
- bool destructible = true;
- };
- /* Splitting strings into words. */
- extern const char *default_word_break_characters (void);
- /* Base class from which all other language classes derive. */
- struct language_defn
- {
- language_defn (enum language lang)
- : la_language (lang)
- {
- /* We should only ever create one instance of each language. */
- gdb_assert (languages[lang] == nullptr);
- languages[lang] = this;
- }
- /* Which language this is. */
- const enum language la_language;
- /* Name of the language. */
- virtual const char *name () const = 0;
- /* Natural or official name of the language. */
- virtual const char *natural_name () const = 0;
- /* Return a vector of file extensions for this language. The extension
- must include the ".", like ".c". If this language doesn't need to
- provide any filename extensions, this may be an empty vector (which is
- the default). */
- virtual const std::vector<const char *> &filename_extensions () const
- {
- static const std::vector<const char *> no_extensions;
- return no_extensions;
- }
- /* Print the index of an element of an array. This default
- implementation prints using C99 syntax. */
- virtual void print_array_index (struct type *index_type,
- LONGEST index_value,
- struct ui_file *stream,
- const value_print_options *options) const;
- /* Given a symbol VAR, the corresponding block VAR_BLOCK (if any) and a
- stack frame id FRAME, read the value of the variable and return (pointer
- to a) struct value containing the value.
- VAR_BLOCK is needed if there's a possibility for VAR to be outside
- FRAME. This is what happens if FRAME correspond to a nested function
- and VAR is defined in the outer function. If callers know that VAR is
- located in FRAME or is global/static, NULL can be passed as VAR_BLOCK.
- Throw an error if the variable cannot be found. */
- virtual struct value *read_var_value (struct symbol *var,
- const struct block *var_block,
- struct frame_info *frame) const;
- /* Return information about whether TYPE should be passed
- (and returned) by reference at the language level. The default
- implementation returns a LANGUAGE_PASS_BY_REF_INFO initialised in its
- default state. */
- virtual struct language_pass_by_ref_info pass_by_reference_info
- (struct type *type) const
- {
- return {};
- }
- /* Return true if SYMBOL represents an entity that is not
- supposed to be seen by the user. To be used to filter symbols
- during printing. */
- virtual bool symbol_printing_suppressed (struct symbol *symbol) const
- {
- return false;
- }
- /* The per-architecture (OS/ABI) language information. */
- virtual void language_arch_info (struct gdbarch *,
- struct language_arch_info *) const = 0;
- /* Find the definition of the type with the given name. */
- virtual struct type *lookup_transparent_type (const char *name) const
- {
- return basic_lookup_transparent_type (name);
- }
- /* Find all symbols in the current program space matching NAME in
- DOMAIN, according to this language's rules.
- The search is done in BLOCK only.
- The caller is responsible for iterating up through superblocks
- if desired.
- For each one, call CALLBACK with the symbol. If CALLBACK
- returns false, the iteration ends at that point.
- This field may not be NULL. If the language does not need any
- special processing here, 'iterate_over_symbols' should be
- used as the definition. */
- virtual bool iterate_over_symbols
- (const struct block *block, const lookup_name_info &name,
- domain_enum domain,
- gdb::function_view<symbol_found_callback_ftype> callback) const
- {
- return ::iterate_over_symbols (block, name, domain, callback);
- }
- /* Return a pointer to the function that should be used to match a
- symbol name against LOOKUP_NAME, according to this language's
- rules. The matching algorithm depends on LOOKUP_NAME. For
- example, on Ada, the matching algorithm depends on the symbol
- name (wild/full/verbatim matching), and on whether we're doing
- a normal lookup or a completion match lookup.
- As Ada wants to capture symbol matching for all languages in some
- cases, then this method is a non-overridable interface. Languages
- should override GET_SYMBOL_NAME_MATCHER_INNER if they need to. */
- symbol_name_matcher_ftype *get_symbol_name_matcher
- (const lookup_name_info &lookup_name) const;
- /* If this language allows compilation from the gdb command line,
- then this method will return an instance of struct gcc_context
- appropriate to the language. If compilation for this language is
- generally supported, but something goes wrong then an exception
- is thrown. If compilation is not supported for this language
- then this method returns NULL. */
- virtual std::unique_ptr<compile_instance> get_compile_instance () const;
- /* This method must be overridden if 'get_compile_instance' is
- overridden.
- This takes the user-supplied text and returns a new bit of code
- to compile.
- INST is the compiler instance being used.
- INPUT is the user's input text.
- GDBARCH is the architecture to use.
- EXPR_BLOCK is the block in which the expression is being
- parsed.
- EXPR_PC is the PC at which the expression is being parsed. */
- virtual std::string compute_program (compile_instance *inst,
- const char *input,
- struct gdbarch *gdbarch,
- const struct block *expr_block,
- CORE_ADDR expr_pc) const
- {
- gdb_assert_not_reached ("language_defn::compute_program");
- }
- /* Hash the given symbol search name. */
- virtual unsigned int search_name_hash (const char *name) const;
- /* Demangle a symbol according to this language's rules. Unlike
- la_demangle, this does not take any options.
- *DEMANGLED will be set by this function.
- If this function returns false, then *DEMANGLED must always be set
- to NULL.
- If this function returns true, the implementation may set this to
- a xmalloc'd string holding the demangled form. However, it is
- not required to. The string, if any, is owned by the caller.
- The resulting string should be of the form that will be
- installed into a symbol. */
- virtual bool sniff_from_mangled_name
- (const char *mangled, gdb::unique_xmalloc_ptr<char> *demangled) const
- {
- *demangled = nullptr;
- return false;
- }
- /* Return demangled language symbol version of MANGLED, or NULL. */
- virtual gdb::unique_xmalloc_ptr<char> demangle_symbol (const char *mangled,
- int options) const
- {
- return nullptr;
- }
- /* Print TYPE to STREAM using syntax appropriate for this language.
- LEVEL is the depth to indent lines by. VARSTRING, if not NULL or the
- empty string, is the name of a variable and TYPE should be printed in
- the form of a declaration of a variable named VARSTRING. */
- virtual void print_type (struct type *type, const char *varstring,
- struct ui_file *stream, int show, int level,
- const struct type_print_options *flags) const = 0;
- /* PC is possibly an unknown languages trampoline.
- If that PC falls in a trampoline belonging to this language, return
- the address of the first pc in the real function, or 0 if it isn't a
- language tramp for this language. */
- virtual CORE_ADDR skip_trampoline (struct frame_info *fi, CORE_ADDR pc) const
- {
- return (CORE_ADDR) 0;
- }
- /* Return class name of a mangled method name or NULL. */
- virtual char *class_name_from_physname (const char *physname) const
- {
- return nullptr;
- }
- /* The list of characters forming word boundaries. */
- virtual const char *word_break_characters (void) const
- {
- return default_word_break_characters ();
- }
- /* Add to the completion tracker all symbols which are possible
- completions for TEXT. WORD is the entire command on which the
- completion is being made. If CODE is TYPE_CODE_UNDEF, then all
- symbols should be examined; otherwise, only STRUCT_DOMAIN symbols
- whose type has a code of CODE should be matched. */
- virtual void collect_symbol_completion_matches
- (completion_tracker &tracker,
- complete_symbol_mode mode,
- symbol_name_match_type name_match_type,
- const char *text,
- const char *word,
- enum type_code code) const
- {
- return default_collect_symbol_completion_matches_break_on
- (tracker, mode, name_match_type, text, word, "", code);
- }
- /* This is a function that lookup_symbol will call when it gets to
- the part of symbol lookup where C looks up static and global
- variables. This default implements the basic C lookup rules. */
- virtual struct block_symbol lookup_symbol_nonlocal
- (const char *name,
- const struct block *block,
- const domain_enum domain) const;
- /* Return an expression that can be used for a location
- watchpoint. TYPE is a pointer type that points to the memory
- to watch, and ADDR is the address of the watched memory. */
- virtual gdb::unique_xmalloc_ptr<char> watch_location_expression
- (struct type *type, CORE_ADDR addr) const;
- /* List of all known languages. */
- static const struct language_defn *languages[nr_languages];
- /* Print a top-level value using syntax appropriate for this language. */
- virtual void value_print (struct value *val, struct ui_file *stream,
- const struct value_print_options *options) const;
- /* Print a value using syntax appropriate for this language. RECURSE is
- the recursion depth. It is zero-based. */
- virtual void value_print_inner
- (struct value *val, struct ui_file *stream, int recurse,
- const struct value_print_options *options) const;
- /* Parser function. */
- virtual int parser (struct parser_state *ps) const;
- /* Print the character CH (of type CHTYPE) on STREAM as part of the
- contents of a literal string whose delimiter is QUOTER. */
- virtual void emitchar (int ch, struct type *chtype,
- struct ui_file *stream, int quoter) const;
- virtual void printchar (int ch, struct type *chtype,
- struct ui_file * stream) const;
- /* Print the character string STRING, printing at most LENGTH characters.
- Printing stops early if the number hits print_max; repeat counts
- are printed as appropriate. Print ellipses at the end if we
- had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
- virtual void printstr (struct ui_file *stream, struct type *elttype,
- const gdb_byte *string, unsigned int length,
- const char *encoding, int force_ellipses,
- const struct value_print_options *options) const;
- /* Print a typedef using syntax appropriate for this language.
- TYPE is the underlying type. NEW_SYMBOL is the symbol naming
- the type. STREAM is the output stream on which to print. */
- virtual void print_typedef (struct type *type, struct symbol *new_symbol,
- struct ui_file *stream) const;
- /* Return true if TYPE is a string type. */
- virtual bool is_string_type_p (struct type *type) const;
- /* Return a string that is used by the 'set print max-depth' setting.
- When GDB replaces a struct or union (during value printing) that is
- "too deep" this string is displayed instead. The default value here
- suits most languages. If overriding then the string here should
- ideally be similar in style to the default; an opener, three '.', and
- a closer. */
- virtual const char *struct_too_deep_ellipsis () const
- { return "{...}"; }
- /* If this returns non-NULL then the string returned specifies the name
- of the implicit local variable that refers to the current object
- instance. Return NULL (the default) for languages that have no name
- for the current object instance. */
- virtual const char *name_of_this () const
- { return nullptr; }
- /* Return false if the language has first-class arrays. Return true if
- there are no array values, and array objects decay to pointers, as in
- C. The default is true as currently most supported languages behave
- in this manner. */
- virtual bool c_style_arrays_p () const
- { return true; }
- /* Return the index to use for extracting the first element of a string,
- or as the lower bound when creating a new string. The default of
- choosing 0 or 1 based on C_STYLE_ARRAYS_P works for all currently
- supported languages except Modula-2. */
- virtual char string_lower_bound () const
- { return c_style_arrays_p () ? 0 : 1; }
- /* Returns true if the symbols names should be stored in GDB's data
- structures for minimal/partial/full symbols using their linkage (aka
- mangled) form; false if the symbol names should be demangled first.
- Most languages implement symbol lookup by comparing the demangled
- names, in which case it is advantageous to store that information
- already demangled, and so would return false, which is the default.
- On the other hand, some languages have opted for doing symbol lookups
- by comparing mangled names instead, for reasons usually specific to
- the language. Those languages should override this function and
- return true.
- And finally, other languages such as C or Asm do not have the concept
- of mangled vs demangled name, so those languages should also override
- this function and return true, to prevent any accidental demangling
- through an unrelated language's demangler. */
- virtual bool store_sym_names_in_linkage_form_p () const
- { return false; }
- /* Default range checking preference. The return value from this
- function provides the automatic setting for 'set check range'. As a
- consequence a user is free to override this setting if they want. */
- virtual bool range_checking_on_by_default () const
- { return false; }
- /* Is this language case sensitive? The return value from this function
- provides the automativ setting for 'set case-sensitive', as a
- consequence, a user is free to override this setting if they want. */
- virtual enum case_sensitivity case_sensitivity () const
- { return case_sensitive_on; }
- /* Multi-dimensional array ordering. */
- virtual enum array_ordering array_ordering () const
- { return array_row_major; }
- /* Style of macro expansion, if any, supported by this language. The
- default is no macro expansion. */
- virtual enum macro_expansion macro_expansion () const
- { return macro_expansion_no; }
- /* Return a structure containing various operations on varobj specific
- for this language. */
- virtual const struct lang_varobj_ops *varobj_ops () const;
- protected:
- /* This is the overridable part of the GET_SYMBOL_NAME_MATCHER method.
- See that method for a description of the arguments. */
- virtual symbol_name_matcher_ftype *get_symbol_name_matcher_inner
- (const lookup_name_info &lookup_name) const;
- };
- /* Pointer to the language_defn for our current language. This pointer
- always points to *some* valid struct; it can be used without checking
- it for validity.
- The current language affects expression parsing and evaluation
- (FIXME: it might be cleaner to make the evaluation-related stuff
- separate exp_opcodes for each different set of semantics. We
- should at least think this through more clearly with respect to
- what happens if the language is changed between parsing and
- evaluation) and printing of things like types and arrays. It does
- *not* affect symbol-reading-- each source file in a symbol-file has
- its own language and we should keep track of that regardless of the
- language when symbols are read. If we want some manual setting for
- the language of symbol files (e.g. detecting when ".c" files are
- C++), it should be a separate setting from the current_language. */
- extern const struct language_defn *current_language;
- /* Pointer to the language_defn expected by the user, e.g. the language
- of main(), or the language we last mentioned in a message, or C. */
- extern const struct language_defn *expected_language;
- /* Warning issued when current_language and the language of the current
- frame do not match. */
- extern const char lang_frame_mismatch_warn[];
- /* language_mode ==
- language_mode_auto: current_language automatically set upon selection
- of scope (e.g. stack frame)
- language_mode_manual: current_language set only by user. */
- extern enum language_mode
- {
- language_mode_auto, language_mode_manual
- }
- language_mode;
- /* Return the type that should be used for booleans for language L in
- GDBARCH. */
- struct type *language_bool_type (const struct language_defn *l,
- struct gdbarch *gdbarch);
- /* Return the type that should be used for characters within a string for
- language L in GDBARCH. */
- struct type *language_string_char_type (const struct language_defn *l,
- struct gdbarch *gdbarch);
- /* Look up a type from the set of OS/ABI specific types defined in
- GDBARCH for language L. NAME is used for selecting the matching
- type, and is passed through to the corresponding
- lookup_primitive_type member function inside the language_arch_info
- class. */
- struct type *language_lookup_primitive_type (const struct language_defn *l,
- struct gdbarch *gdbarch,
- const char *name);
- /* Look up a type from the set of OS/ABI specific types defined in
- GDBARCH for language L. FILTER is used for selecting the matching
- type, and is passed through to the corresponding
- lookup_primitive_type member function inside the language_arch_info
- class. */
- struct type *language_lookup_primitive_type
- (const struct language_defn *la,
- struct gdbarch *gdbarch,
- gdb::function_view<bool (struct type *)> filter);
- /* Wrapper around language_lookup_primitive_type to return the
- corresponding symbol. */
- struct symbol *
- language_lookup_primitive_type_as_symbol (const struct language_defn *l,
- struct gdbarch *gdbarch,
- const char *name);
- /* These macros define the behaviour of the expression
- evaluator. */
- /* Should we range check values against the domain of their type? */
- #define RANGE_CHECK (range_check != range_check_off)
- /* "cast" really means conversion. */
- /* FIXME -- should be a setting in language_defn. */
- #define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \
- (LANG)->la_language == language_cplus || \
- (LANG)->la_language == language_objc)
- /* Print out the current language settings: language, range and
- type checking. */
- extern void language_info ();
- extern enum language set_language (enum language);
- /* Test a character to decide whether it can be printed in literal form
- or needs to be printed in another representation. For example,
- in C the literal form of the character with octal value 141 is 'a'
- and the "other representation" is '\141'. The "other representation"
- is program language dependent. */
- #define PRINT_LITERAL_FORM(c) \
- ((c) >= 0x20 \
- && ((c) < 0x7F || (c) >= 0xA0) \
- && (!sevenbit_strings || (c) < 0x80))
- /* Error messages */
- extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
- /* Misc: The string representing a particular enum language. */
- extern enum language language_enum (const char *str);
- extern const struct language_defn *language_def (enum language);
- extern const char *language_str (enum language);
- /* Check for a language-specific trampoline. */
- extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
- /* Return demangled language symbol, or NULL. */
- extern gdb::unique_xmalloc_ptr<char> language_demangle
- (const struct language_defn *current_language,
- const char *mangled, int options);
- /* Return information about whether TYPE should be passed
- (and returned) by reference at the language level. */
- struct language_pass_by_ref_info language_pass_by_reference (struct type *type);
- void c_get_string (struct value *value,
- gdb::unique_xmalloc_ptr<gdb_byte> *buffer,
- int *length, struct type **char_type,
- const char **charset);
- /* Get LANG's symbol_name_matcher method for LOOKUP_NAME. Returns
- default_symbol_name_matcher if not set. LANG is used as a hint;
- the function may ignore it depending on the current language and
- LOOKUP_NAME. Specifically, if the current language is Ada, this
- may return an Ada matcher regardless of LANG. */
- symbol_name_matcher_ftype *get_symbol_name_matcher
- (const language_defn *lang, const lookup_name_info &lookup_name);
- /* Save the current language and restore it upon destruction. */
- class scoped_restore_current_language
- {
- public:
- explicit scoped_restore_current_language ()
- : m_lang (current_language->la_language)
- {
- }
- ~scoped_restore_current_language ()
- {
- set_language (m_lang);
- }
- scoped_restore_current_language (const scoped_restore_current_language &)
- = delete;
- scoped_restore_current_language &operator=
- (const scoped_restore_current_language &) = delete;
- private:
- enum language m_lang;
- };
- /* If language_mode is language_mode_auto,
- then switch current language to the language of SYM
- and restore current language upon destruction.
- Else do nothing. */
- class scoped_switch_to_sym_language_if_auto
- {
- public:
- explicit scoped_switch_to_sym_language_if_auto (const struct symbol *sym)
- {
- if (language_mode == language_mode_auto)
- {
- m_lang = current_language->la_language;
- m_switched = true;
- set_language (sym->language ());
- }
- else
- {
- m_switched = false;
- /* Assign to m_lang to silence a GCC warning. See
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635. */
- m_lang = language_unknown;
- }
- }
- ~scoped_switch_to_sym_language_if_auto ()
- {
- if (m_switched)
- set_language (m_lang);
- }
- DISABLE_COPY_AND_ASSIGN (scoped_switch_to_sym_language_if_auto);
- private:
- bool m_switched;
- enum language m_lang;
- };
- #endif /* defined (LANGUAGE_H) */
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