Make "show remote exec-file" inferior-aware

[deliverable/binutils-gdb.git] / gdb / language.h

diff --git a/gdb/language.h b/gdb/language.h
index 8782ef0d4ef21116bb26da3a5615c217da61e164..b344a4a2ca6acb3f3c2ae939a4c946f6430cbe2c 100644 (file)
--- a/gdb/language.h
+++ b/gdb/language.h
@@ -1,6 +1,6 @@
 /* Source-language-related definitions for GDB.
 
 /* Source-language-related definitions for GDB.
 

-   Copyright (C) 1991-2015 Free Software Foundation, Inc.
+   Copyright (C) 1991-2020 Free Software Foundation, Inc.

 
    Contributed by the Department of Computer Science at the State University
    of New York at Buffalo.
 
    Contributed by the Department of Computer Science at the State University
    of New York at Buffalo.


@@ -24,18 +24,21 @@
 #define LANGUAGE_H 1
 
 #include "symtab.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;
 
 /* Forward decls for prototypes.  */
 struct value;
 struct objfile;
 struct frame_info;

-struct expression;

 struct ui_file;
 struct value_print_options;
 struct type_print_options;
 struct lang_varobj_ops;
 struct parser_state;
 struct ui_file;
 struct value_print_options;
 struct type_print_options;
 struct lang_varobj_ops;
 struct parser_state;

-struct compile_instance;
+class compile_instance;
+struct completion_match_for_lcd;
+class innermost_block_tracker;

 
 #define MAX_FORTRAN_DIMS  7    /* Maximum number of F77 array dims.  */
 
 
 #define MAX_FORTRAN_DIMS  7    /* Maximum number of F77 array dims.  */
 


@@ -125,15 +128,46 @@ struct language_arch_info
   struct type *bool_type_default;
 };
 
   struct type *bool_type_default;
 };
 

-/* A pointer to a function expected to return nonzero if
-   SYMBOL_SEARCH_NAME matches the given LOOKUP_NAME.
+/* 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.

 
 

-   SYMBOL_SEARCH_NAME should be a symbol's "search" name.
-   LOOKUP_NAME should be the name of an entity after it has been
-   transformed for lookup.  */
+   The default values of the fields are chosen to give correct semantics
+   for primitive types and for simple aggregate types, such as

 
 

-typedef int (*symbol_name_cmp_ftype) (const char *symbol_search_name,
-                                         const char *lookup_name);
+   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;
+};

 
 /* Structure tying together assorted information about a language.  */
 
 
 /* Structure tying together assorted information about a language.  */
 


@@ -164,6 +198,13 @@ struct language_defn
     /* Style of macro expansion, if any, supported by this language.  */
     enum macro_expansion la_macro_expansion;
 
     /* Style of macro expansion, if any, supported by this language.  */
     enum macro_expansion la_macro_expansion;
 

+    /* A NULL-terminated array 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 NULL.  */
+
+    const char *const *la_filename_extensions;
+

     /* Definitions related to expression printing, prefixifying, and
        dumping.  */
 
     /* Definitions related to expression printing, prefixifying, and
        dumping.  */
 


@@ -173,17 +214,16 @@ struct language_defn
 
     int (*la_parser) (struct parser_state *);
 
 
     int (*la_parser) (struct parser_state *);
 

-    /* Parser error function.  */
-
-    void (*la_error) (char *);
-

     /* Given an expression *EXPP created by prefixifying the result of
        la_parser, perform any remaining processing necessary to complete
        its translation.  *EXPP may change; la_post_parser is responsible 
        for releasing its previous contents, if necessary.  If 
     /* Given an expression *EXPP created by prefixifying the result of
        la_parser, perform any remaining processing necessary to complete
        its translation.  *EXPP may change; la_post_parser is responsible 
        for releasing its previous contents, if necessary.  If 

-       VOID_CONTEXT_P, then no value is expected from the expression.  */
+       VOID_CONTEXT_P, then no value is expected from the expression.
+       If COMPLETING is non-zero, then the expression has been parsed
+       for completion, not evaluation.  */

 
 

-    void (*la_post_parser) (struct expression ** expp, int void_context_p);
+    void (*la_post_parser) (expression_up *expp, int void_context_p,
+                           int completing, innermost_block_tracker *tracker);

 
     void (*la_printchar) (int ch, struct type *chtype,
                          struct ui_file * stream);
 
     void (*la_printchar) (int ch, struct type *chtype,
                          struct ui_file * stream);


@@ -212,9 +252,6 @@ struct language_defn
        
        TYPE is the type of the sub-object to be printed.
 
        
        TYPE is the type of the sub-object to be printed.
 

-       CONTENTS holds the bits of the value.  This holds the entire
-       enclosing object.
-

        EMBEDDED_OFFSET is the offset into the outermost object of the
        sub-object represented by TYPE.  This is the object which this
        call should print.  Note that the enclosing type is not
        EMBEDDED_OFFSET is the offset into the outermost object of the
        sub-object represented by TYPE.  This is the object which this
        call should print.  Note that the enclosing type is not


@@ -230,10 +267,9 @@ struct language_defn
        printing.  */
 
     void (*la_val_print) (struct type *type,
        printing.  */
 
     void (*la_val_print) (struct type *type,

-                         const gdb_byte *contents,

                          int embedded_offset, CORE_ADDR address,
                          struct ui_file *stream, int recurse,
                          int embedded_offset, CORE_ADDR address,
                          struct ui_file *stream, int recurse,

-                         const struct value *val,
+                         struct value *val,

                          const struct value_print_options *options);
 
     /* Print a top-level value using syntax appropriate for this language.  */
                          const struct value_print_options *options);
 
     /* Print a top-level value using syntax appropriate for this language.  */


@@ -241,13 +277,19 @@ struct language_defn
     void (*la_value_print) (struct value *, struct ui_file *,
                            const struct value_print_options *);
 
     void (*la_value_print) (struct value *, struct ui_file *,
                            const struct value_print_options *);
 

-    /* Given a symbol VAR, and a stack frame id FRAME, read the value
-       of the variable an return (pointer to a) struct value containing
-       the value.
+    /* 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.  */
 
     struct value *(*la_read_var_value) (struct symbol *var,
 
        Throw an error if the variable cannot be found.  */
 
     struct value *(*la_read_var_value) (struct symbol *var,

+                                       const struct block *var_block,

                                        struct frame_info *frame);
 
     /* PC is possibly an unknown languages trampoline.
                                        struct frame_info *frame);
 
     /* PC is possibly an unknown languages trampoline.


@@ -261,7 +303,27 @@ struct language_defn
     /* If this is non-NULL, specifies the name that of the implicit
        local variable that refers to the current object instance.  */
 
     /* If this is non-NULL, specifies the name that of the implicit
        local variable that refers to the current object instance.  */
 

-    char *la_name_of_this;
+    const char *la_name_of_this;
+
+    /* 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 set this field to false.
+
+       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 set this field
+       to true.
+
+       And finally, other languages such as C or Asm do not have
+       the concept of mangled vs demangled name, so those languages
+       should set this field to true as well, to prevent any accidental
+       demangling through an unrelated language's demangler.  */
+
+    const bool la_store_sym_names_in_linkage_form_p;

 
     /* 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
 
     /* 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


@@ -279,6 +341,22 @@ struct language_defn
     /* Return demangled language symbol, or NULL.  */
     char *(*la_demangle) (const char *mangled, int options);
 
     /* Return demangled language symbol, or NULL.  */
     char *(*la_demangle) (const char *mangled, int options);
 

+    /* 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 0, then *DEMANGLED must always be set
+       to NULL.
+
+       If this function returns 1, 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.  */
+    int (*la_sniff_from_mangled_name) (const char *mangled, char **demangled);
+

     /* Return class name of a mangled method name or NULL.  */
     char *(*la_class_name_from_physname) (const char *physname);
 
     /* Return class name of a mangled method name or NULL.  */
     char *(*la_class_name_from_physname) (const char *physname);
 


@@ -295,16 +373,20 @@ struct language_defn
     char string_lower_bound;
 
     /* The list of characters forming word boundaries.  */
     char string_lower_bound;
 
     /* The list of characters forming word boundaries.  */

-    char *(*la_word_break_characters) (void);
+    const char *(*la_word_break_characters) (void);

 
 

-    /* Should return a vector of all symbols which are possible
+    /* 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.  */
        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.  */

-    VEC (char_ptr) *(*la_make_symbol_completion_list) (const char *text,
-                                                      const char *word,
-                                                      enum type_code code);
+    void (*la_collect_symbol_completion_matches)
+      (completion_tracker &tracker,
+       complete_symbol_mode mode,
+       symbol_name_match_type match_type,
+       const char *text,
+       const char *word,
+       enum type_code code);

 
     /* The per-architecture (OS/ABI) language information.  */
     void (*la_language_arch_info) (struct gdbarch *,
 
     /* The per-architecture (OS/ABI) language information.  */
     void (*la_language_arch_info) (struct gdbarch *,


@@ -315,30 +397,29 @@ struct language_defn
                                   struct ui_file *stream,
                                   const struct value_print_options *options);
 
                                   struct ui_file *stream,
                                   const struct value_print_options *options);
 

-    /* Return non-zero if TYPE should be passed (and returned) by
-       reference at the language level.  */
-    int (*la_pass_by_reference) (struct type *type);
-
-    /* Obtain a string from the inferior, storing it in a newly allocated
-       buffer in BUFFER, which should be freed by the caller.  If the
-       in- and out-parameter *LENGTH is specified at -1, the string is
-       read until a null character of the appropriate width is found -
-       otherwise the string is read to the length of characters specified.
-       On completion, *LENGTH will hold the size of the string in characters.
-       If a *LENGTH of -1 was specified it will count only actual
-       characters, excluding any eventual terminating null character.
-       Otherwise *LENGTH will include all characters - including any nulls.
-       CHARSET will hold the encoding used in the string.  */
-    void (*la_get_string) (struct value *value, gdb_byte **buffer, int *length,
-                          struct type **chartype, const char **charset);
-
-    /* Return a pointer to the function that should be used to match
-       a symbol name against LOOKUP_NAME. This is mostly for languages
-       such as Ada where the matching algorithm depends on LOOKUP_NAME.
-
-       This field may be NULL, in which case strcmp_iw will be used
-       to perform the matching.  */
-    symbol_name_cmp_ftype (*la_get_symbol_name_cmp) (const char *lookup_name);
+    /* Return information about whether TYPE should be passed
+       (and returned) by reference at the language level.  */
+    struct language_pass_by_ref_info (*la_pass_by_reference)
+      (struct type *type);
+
+    /* 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.  */
+    gdb::unique_xmalloc_ptr<char> (*la_watch_location_expression)
+         (struct type *type, CORE_ADDR addr);
+
+    /* 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.
+
+       This field may be NULL, in which case
+       default_symbol_name_matcher is used to perform the
+       matching.  */
+    symbol_name_matcher_ftype *(*la_get_symbol_name_matcher)
+      (const lookup_name_info &);

 
     /* Find all symbols in the current program space matching NAME in
        DOMAIN, according to this language's rules.
 
     /* Find all symbols in the current program space matching NAME in
        DOMAIN, according to this language's rules.


@@ -347,18 +428,21 @@ struct language_defn
        The caller is responsible for iterating up through superblocks
        if desired.
 
        The caller is responsible for iterating up through superblocks
        if desired.
 

-       For each one, call CALLBACK with the symbol and the DATA
-       argument.  If CALLBACK returns zero, the iteration ends at that
-       point.
+       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.  */
 
        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.  */

-    void (*la_iterate_over_symbols) (const struct block *block,
-                                    const char *name,
-                                    domain_enum domain,
-                                    symbol_found_callback_ftype *callback,
-                                    void *data);
+    bool (*la_iterate_over_symbols)
+      (const struct block *block, const lookup_name_info &name,
+       domain_enum domain,
+       gdb::function_view<symbol_found_callback_ftype> callback);
+
+    /* Hash the given symbol search name.  Use
+       default_search_name_hash if no special treatment is
+       required.  */
+    unsigned int (*la_search_name_hash) (const char *name);

 
     /* Various operations on varobj.  */
     const struct lang_varobj_ops *la_varobj_ops;
 
     /* Various operations on varobj.  */
     const struct lang_varobj_ops *la_varobj_ops;


@@ -371,14 +455,14 @@ struct language_defn
        instance is owned by its caller and must be deallocated by
        calling its 'destroy' method.  */
 
        instance is owned by its caller and must be deallocated by
        calling its 'destroy' method.  */
 

-    struct compile_instance *(*la_get_compile_instance) (void);
+    compile_instance *(*la_get_compile_instance) (void);

 
     /* This method must be defined if 'la_get_gcc_context' is defined.
        If 'la_get_gcc_context' is not defined, then this method is
        ignored.
 
 
     /* This method must be defined if 'la_get_gcc_context' is defined.
        If 'la_get_gcc_context' is not defined, then this method is
        ignored.
 

-       This takes the user-supplied text and returns a newly malloc'd
-       bit of code to compile.  The caller owns the result.
+       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.
 
        INST is the compiler instance being used.
        INPUT is the user's input text.


@@ -387,21 +471,22 @@ struct language_defn
        parsed.
        EXPR_PC is the PC at which the expression is being parsed.  */
 
        parsed.
        EXPR_PC is the PC at which the expression is being parsed.  */
 

-    char *(*la_compute_program) (struct compile_instance *inst,
-                                const char *input,
-                                struct gdbarch *gdbarch,
-                                const struct block *expr_block,
-                                CORE_ADDR expr_pc);
+    std::string (*la_compute_program) (compile_instance *inst,
+                                      const char *input,
+                                      struct gdbarch *gdbarch,
+                                      const struct block *expr_block,
+                                      CORE_ADDR expr_pc);

 
 

-    /* Add fields above this point, so the magic number is always last.  */
-    /* Magic number for compat checking.  */
+    /* Return true if TYPE is a string type.  */
+    bool (*la_is_string_type_p) (struct type *type);

 
 

-    long la_magic;
+    /* This string 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.  */
+    const char *la_struct_too_deep_ellipsis;

 
   };
 
 
   };
 

-#define LANG_MAGIC     910823L
-

 /* 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.
 /* 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.


@@ -425,6 +510,11 @@ extern const struct language_defn *current_language;
 
 extern const struct language_defn *expected_language;
 
 
 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 == 
    language_mode_auto:   current_language automatically set upon selection
    of scope (e.g. stack frame)


@@ -486,9 +576,6 @@ extern enum language set_language (enum language);
 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
   (current_language->la_print_typedef(type,new_symbol,stream))
 
 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
   (current_language->la_print_typedef(type,new_symbol,stream))
 

-#define LA_VAL_PRINT(type,valaddr,offset,addr,stream,val,recurse,options) \
-  (current_language->la_val_print(type,valaddr,offset,addr,stream, \
-                                 val,recurse,options))

 #define LA_VALUE_PRINT(val,stream,options) \
   (current_language->la_value_print(val,stream,options))
 
 #define LA_VALUE_PRINT(val,stream,options) \
   (current_language->la_value_print(val,stream,options))
 


@@ -499,15 +586,12 @@ extern enum language set_language (enum language);
                                 encoding, force_ellipses,options))
 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
   (current_language->la_emitchar(ch, type, stream, quoter))
                                 encoding, force_ellipses,options))
 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
   (current_language->la_emitchar(ch, type, stream, quoter))

-#define LA_GET_STRING(value, buffer, length, chartype, encoding) \
-  (current_language->la_get_string(value, buffer, length, chartype, encoding))

 
 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \
   (current_language->la_print_array_index(index_value, stream, options))
 
 
 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \
   (current_language->la_print_array_index(index_value, stream, options))
 

-#define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK, DATA) \
-  (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK, \
-                                             DATA))
+#define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \
+  (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK))

 
 /* Test a character to decide whether it can be printed in literal form
    or needs to be printed in another representation.  For example,
 
 /* Test a character to decide whether it can be printed in literal form
    or needs to be printed in another representation.  For example,


@@ -524,6 +608,10 @@ extern enum language set_language (enum language);
 
 extern int pointer_type (struct type *);
 
 
 extern int pointer_type (struct type *);
 

+/* Return true if TYPE is a string type, otherwise return false.  This
+   default implementation only detects TYPE_CODE_STRING.  */
+extern bool default_is_string_type_p (struct type *type);
+

 /* Error messages */
 
 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 /* Error messages */
 
 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);


@@ -534,18 +622,12 @@ extern int value_true (struct value *);
 
 /* Misc:  The string representing a particular enum language.  */
 
 
 /* Misc:  The string representing a particular enum language.  */
 

-extern enum language language_enum (char *str);
+extern enum language language_enum (const char *str);

 
 extern const struct language_defn *language_def (enum language);
 
 extern const char *language_str (enum language);
 
 
 extern const struct language_defn *language_def (enum language);
 
 extern const char *language_str (enum language);
 

-/* Add a language to the set known by GDB (at initialization time).  */
-
-extern void add_language (const struct language_defn *);
-
-extern enum language get_frame_language (struct frame_info *frame);    /* In stack.c */
-

 /* Check for a language-specific trampoline.  */
 
 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
 /* Check for a language-specific trampoline.  */
 
 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);


@@ -554,35 +636,149 @@ extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
 extern char *language_demangle (const struct language_defn *current_language, 
                                const char *mangled, int options);
 
 extern char *language_demangle (const struct language_defn *current_language, 
                                const char *mangled, int options);
 

+/* A wrapper for la_sniff_from_mangled_name.  The arguments and result
+   are as for the method.  */
+
+extern int language_sniff_from_mangled_name (const struct language_defn *lang,
+                                            const char *mangled,
+                                            char **demangled);
+

 /* Return class name from physname, or NULL.  */
 extern char *language_class_name_from_physname (const struct language_defn *,
                                                const char *physname);
 
 /* Splitting strings into words.  */
 /* Return class name from physname, or NULL.  */
 extern char *language_class_name_from_physname (const struct language_defn *,
                                                const char *physname);
 
 /* Splitting strings into words.  */

-extern char *default_word_break_characters (void);
+extern const char *default_word_break_characters (void);

 
 /* Print the index of an array element using the C99 syntax.  */
 extern void default_print_array_index (struct value *index_value,
                                        struct ui_file *stream,
                                       const struct value_print_options *options);
 
 
 /* Print the index of an array element using the C99 syntax.  */
 extern void default_print_array_index (struct value *index_value,
                                        struct ui_file *stream,
                                       const struct value_print_options *options);
 

-/* Return non-zero if TYPE should be passed (and returned) by
-   reference at the language level.  */
-int language_pass_by_reference (struct type *type);
+/* 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);

 
 

-/* Return zero; by default, types are passed by value at the language
-   level.  The target ABI may pass or return some structs by reference
-   independent of this.  */
-int default_pass_by_reference (struct type *type);
+/* Return a default struct that provides pass-by-reference information
+   about the given TYPE.  Languages should update the default values
+   as appropriate.  */
+struct language_pass_by_ref_info default_pass_by_reference (struct type *type);

 
 /* The default implementation of la_print_typedef.  */
 void default_print_typedef (struct type *type, struct symbol *new_symbol,
                            struct ui_file *stream);
 
 
 /* The default implementation of la_print_typedef.  */
 void default_print_typedef (struct type *type, struct symbol *new_symbol,
                            struct ui_file *stream);
 

-void default_get_string (struct value *value, gdb_byte **buffer, int *length,
-                        struct type **char_type, const char **charset);
+/* Default name hashing function.  */
+
+/* Produce an unsigned hash value from SEARCH_NAME that is consistent
+   with strcmp_iw, strcmp, and, at least on Ada symbols, wild_match.
+   That is, two identifiers equivalent according to any of those three
+   comparison operators hash to the same value.  */
+extern unsigned int default_search_name_hash (const char *search_name);
+
+void c_get_string (struct value *value,
+                  gdb::unique_xmalloc_ptr<gdb_byte> *buffer,
+                  int *length, struct type **char_type,
+                  const char **charset);
+
+/* The default implementation of la_symbol_name_matcher.  Matches with
+   strncmp_iw.  */
+extern bool default_symbol_name_matcher
+  (const char *symbol_search_name,
+   const lookup_name_info &lookup_name,
+   completion_match_result *comp_match_res);
+
+/* 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);
+
+/* The languages supported by GDB.  */
+
+extern const struct language_defn auto_language_defn;
+extern const struct language_defn unknown_language_defn;
+extern const struct language_defn minimal_language_defn;
+
+extern const struct language_defn ada_language_defn;
+extern const struct language_defn asm_language_defn;
+extern const struct language_defn c_language_defn;
+extern const struct language_defn cplus_language_defn;
+extern const struct language_defn d_language_defn;
+extern const struct language_defn f_language_defn;
+extern const struct language_defn go_language_defn;
+extern const struct language_defn m2_language_defn;
+extern const struct language_defn objc_language_defn;
+extern const struct language_defn opencl_language_defn;
+extern const struct language_defn pascal_language_defn;
+extern const struct language_defn rust_language_defn;
+
+/* 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.

 
 

-void c_get_string (struct value *value, gdb_byte **buffer, int *length,
-                  struct type **char_type, const char **charset);
+   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) */
 
 #endif /* defined (LANGUAGE_H) */