/* Source-language-related definitions for GDB.
- Copyright (C) 1991-2019 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.
#define LANGUAGE_H 1
#include "symtab.h"
-#include "common/function-view.h"
+#include "gdbsupport/function-view.h"
#include "expression.h"
/* Forward decls for prototypes. */
struct type *bool_type_default;
};
+/* 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;
+};
+
/* Structure tying together assorted information about a language. */
struct language_defn
struct ui_file *stream);
/* Print a value using syntax appropriate for this language.
-
- TYPE is the type of the sub-object to be printed.
-
- 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
- available.
-
- ADDRESS is the address in the inferior of the enclosing object.
+ RECURSE is the recursion depth. It is zero-based. */
- STREAM is the stream on which the value is to be printed.
-
- RECURSE is the recursion depth. It is zero-based.
-
- OPTIONS are the formatting options to be used when
- printing. */
-
- void (*la_val_print) (struct type *type,
- int embedded_offset, CORE_ADDR address,
- struct ui_file *stream, int recurse,
- struct value *val,
- const struct value_print_options *options);
+ void (*la_value_print_inner) (struct value *, struct ui_file *,
+ int recurse,
+ const struct value_print_options *);
/* Print a top-level value using syntax appropriate for this language. */
struct language_arch_info *);
/* Print the index of an element of an array. */
- void (*la_print_array_index) (struct value *index_value,
+ void (*la_print_array_index) (struct type *index_type,
+ LONGEST 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 (*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::unique_xmalloc_ptr<gdb_byte> *buffer,
- int *length, struct type **chartype,
- const char **charset);
+ /* 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
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)
+ 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);
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.
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)
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_type, index_value, stream, options) \
+ (current_language->la_print_array_index(index_type, index_value, stream, \
+ options))
#define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \
(current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK))
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);
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,
+extern void default_print_array_index (struct type *index_type, LONGEST index,
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);
-void default_get_string (struct value *value,
- gdb::unique_xmalloc_ptr<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
{
m_lang = current_language->la_language;
m_switched = true;
- set_language (SYMBOL_LANGUAGE (sym));
+ set_language (sym->language ());
}
else
{
projects / deliverable / binutils-gdb.git / blobdiff