/* Symbol table definitions for GDB.
- Copyright (C) 1986-2015 Free Software Foundation, Inc.
+ Copyright (C) 1986-2016 Free Software Foundation, Inc.
This file is part of GDB.
#include "vec.h"
#include "gdb_vecs.h"
#include "gdbtypes.h"
+#include "common/enum-flags.h"
/* Opaque declarations. */
struct ui_file;
struct language_defn;
struct probe;
struct common_block;
+struct obj_section;
+struct cmd_list_element;
/* Some of the structures in this file are space critical.
The space-critical structures are:
/* This is used by languages which wish to store a demangled name.
currently used by Ada, C++, Java, and Objective C. */
- struct mangled_lang
- {
- const char *demangled_name;
- }
- mangled_lang;
+ const char *demangled_name;
}
language_specific;
This is used to select one of the fields from the language specific
union above. */
- ENUM_BITFIELD(language) language : 8;
+ ENUM_BITFIELD(language) language : LANGUAGE_BITS;
- /* This is only used by Ada. If set, then the 'mangled_lang' field
+ /* This is only used by Ada. If set, then the 'demangled_name' field
of language_specific is valid. Otherwise, the 'obstack' field is
valid. */
unsigned int ada_mangled : 1;
within a given .o file. */
mst_file_text, /* Static version of mst_text */
mst_file_data, /* Static version of mst_data */
- mst_file_bss /* Static version of mst_bss */
+ mst_file_bss, /* Static version of mst_bss */
+ nr_minsym_types
};
+/* The number of enum minimal_symbol_type values, with some padding for
+ reasonable growth. */
+#define MINSYM_TYPE_BITS 4
+gdb_static_assert (nr_minsym_types <= (1 << MINSYM_TYPE_BITS));
+
/* Define a simple structure used to hold some very basic information about
all defined global symbols (text, data, bss, abs, etc). The only required
information is the general_symbol_info.
struct general_symbol_info mginfo;
- /* Size of this symbol. end_psymtab in dbxread.c uses this
+ /* Size of this symbol. dbx_end_psymtab in dbxread.c uses this
information to calculate the end of the partial symtab based on the
address of the last symbol plus the size of the last symbol. */
/* Classification type for this minimal symbol. */
- ENUM_BITFIELD(minimal_symbol_type) type : 8;
+ ENUM_BITFIELD(minimal_symbol_type) type : MINSYM_TYPE_BITS;
/* Non-zero if this symbol was created by gdb.
Such symbols do not appear in the output of "info var|fun". */
/* Fortran common blocks. Their naming must be separate from VAR_DOMAIN.
They also always use LOC_COMMON_BLOCK. */
- COMMON_BLOCK_DOMAIN
+ COMMON_BLOCK_DOMAIN,
+
+ /* This must remain last. */
+ NR_DOMAINS
} domain_enum;
/* The number of bits in a symbol used to represent the domain. */
-#define SYMBOL_DOMAIN_BITS 4
+#define SYMBOL_DOMAIN_BITS 3
+gdb_static_assert (NR_DOMAINS <= (1 << SYMBOL_DOMAIN_BITS));
extern const char *domain_name (domain_enum);
not find it in the full symbol table. But a reference to an external
symbol in a local block shadowing other definition requires full symbol
without possibly having its address available for LOC_STATIC. Testcase
- is provided as `gdb.dwarf2/dw2-unresolved.exp'. */
+ is provided as `gdb.dwarf2/dw2-unresolved.exp'.
+
+ This is also used for thread local storage (TLS) variables. In this case,
+ the address of the TLS variable must be determined when the variable is
+ referenced, from the MSYMBOL_VALUE_RAW_ADDRESS, which is the offset
+ of the TLS variable in the thread local storage of the shared
+ library/object. */
LOC_UNRESOLVED,
LOC_FINAL_VALUE
};
+/* The number of bits needed for values in enum address_class, with some
+ padding for reasonable growth, and room for run-time registered address
+ classes. See symtab.c:MAX_SYMBOL_IMPLS.
+ This is a #define so that we can have a assertion elsewhere to
+ verify that we have reserved enough space for synthetic address
+ classes. */
+#define SYMBOL_ACLASS_BITS 5
+gdb_static_assert (LOC_FINAL_VALUE <= (1 << SYMBOL_ACLASS_BITS));
+
/* The methods needed to implement LOC_COMPUTED. These methods can
use the symbol's .aux_value for additional per-symbol information.
uninitialized in such case. */
void (*find_frame_base_location) (struct symbol *framefunc, CORE_ADDR pc,
const gdb_byte **start, size_t *length);
+
+ /* Return the frame base address. FRAME is the frame for which we want to
+ compute the base address while FRAMEFUNC is the symbol for the
+ corresponding function. Return 0 on failure (FRAMEFUNC may not hold the
+ information we need).
+
+ This method is designed to work with static links (nested functions
+ handling). Static links are function properties whose evaluation returns
+ the frame base address for the enclosing frame. However, there are
+ multiple definitions for "frame base": the content of the frame base
+ register, the CFA as defined by DWARF unwinding information, ...
+
+ So this specific method is supposed to compute the frame base address such
+ as for nested fuctions, the static link computes the same address. For
+ instance, considering DWARF debugging information, the static link is
+ computed with DW_AT_static_link and this method must be used to compute
+ the corresponding DW_AT_frame_base attribute. */
+ CORE_ADDR (*get_frame_base) (struct symbol *framefunc,
+ struct frame_info *frame);
};
/* Functions used with LOC_REGISTER and LOC_REGPARM_ADDR. */
const struct symbol_register_ops *ops_register;
};
-/* The number of bits we reserve in a symbol for the aclass index.
- This is a #define so that we can have a assertion elsewhere to
- verify that we have reserved enough space for synthetic address
- classes. */
-
-#define SYMBOL_ACLASS_BITS 6
-
/* This structure is space critical. See space comments at the top. */
struct symbol
/* An arbitrary data pointer, allowing symbol readers to record
additional information on a per-symbol basis. Note that this data
must be allocated using the same obstack as the symbol itself. */
- /* So far it is only used by LOC_COMPUTED to
- find the location information. For a LOC_BLOCK symbol
- for a function in a compilation unit compiled with DWARF 2
- information, this is information used internally by the DWARF 2
- code --- specifically, the location expression for the frame
+ /* So far it is only used by:
+ LOC_COMPUTED: to find the location information
+ LOC_BLOCK (DWARF2 function): information used internally by the
+ DWARF 2 code --- specifically, the location expression for the frame
base for this function. */
/* FIXME drow/2003-02-21: For the LOC_BLOCK case, it might be better
to add a magic symbol to the block containing this information,
struct symbol *hash_next;
};
+/* Several lookup functions return both a symbol and the block in which the
+ symbol is found. This structure is used in these cases. */
+
+struct block_symbol
+{
+ /* The symbol that was found, or NULL if no symbol was found. */
+ struct symbol *symbol;
+
+ /* If SYMBOL is not NULL, then this is the block in which the symbol is
+ defined. */
+ const struct block *block;
+};
+
extern const struct symbol_impl *symbol_impls;
+/* For convenience. All fields are NULL. This means "there is no
+ symbol". */
+extern const struct block_symbol null_block_symbol;
+
/* Note: There is no accessor macro for symbol.owner because it is
"private". */
struct symtab
{
- /* Unordered chain of all existing symtabs of this objfile. */
+ /* Unordered chain of all filetabs in the compunit, with the exception
+ that the "main" source file is the first entry in the list. */
struct symtab *next;
extern int currently_reading_symtab;
-/* The block in which the most recently looked up symbol was found. */
-
-extern const struct block *block_found;
-
/* symtab.c lookup functions */
extern const char multiple_symbols_ask[];
C++: if IS_A_FIELD_OF_THIS is non-NULL on entry, check to see if
NAME is a field of the current implied argument `this'. If so fill in the
fields of IS_A_FIELD_OF_THIS, otherwise the fields are set to NULL.
- BLOCK_FOUND is set to the block in which NAME is found (in the case of
- a field of `this', value_of_this sets BLOCK_FOUND to the proper value).
The symbol's section is fixed up if necessary. */
-extern struct symbol *lookup_symbol_in_language (const char *,
- const struct block *,
- const domain_enum,
- enum language,
- struct field_of_this_result *);
+extern struct block_symbol
+ lookup_symbol_in_language (const char *,
+ const struct block *,
+ const domain_enum,
+ enum language,
+ struct field_of_this_result *);
/* Same as lookup_symbol_in_language, but using the current language. */
-extern struct symbol *lookup_symbol (const char *, const struct block *,
- const domain_enum,
- struct field_of_this_result *);
+extern struct block_symbol lookup_symbol (const char *,
+ const struct block *,
+ const domain_enum,
+ struct field_of_this_result *);
/* A default version of lookup_symbol_nonlocal for use by languages
that can't think of anything better to do.
This implements the C lookup rules. */
-extern struct symbol *
+extern struct block_symbol
basic_lookup_symbol_nonlocal (const struct language_defn *langdef,
const char *,
const struct block *,
/* Lookup a symbol in the static block associated to BLOCK, if there
is one; do nothing if BLOCK is NULL or a global block.
- Upon success sets BLOCK_FOUND and fixes up the symbol's section
- if necessary. */
+ Upon success fixes up the symbol's section if necessary. */
-extern struct symbol *lookup_symbol_in_static_block (const char *name,
- const struct block *block,
- const domain_enum domain);
+extern struct block_symbol
+ lookup_symbol_in_static_block (const char *name,
+ const struct block *block,
+ const domain_enum domain);
/* Search all static file-level symbols for NAME from DOMAIN.
- Upon success sets BLOCK_FOUND and fixes up the symbol's section
- if necessary. */
+ Upon success fixes up the symbol's section if necessary. */
-extern struct symbol *lookup_static_symbol (const char *name,
- const domain_enum domain);
+extern struct block_symbol lookup_static_symbol (const char *name,
+ const domain_enum domain);
/* Lookup a symbol in all files' global blocks.
if the target requires it.
See gdbarch_iterate_over_objfiles_in_search_order.
- Upon success sets BLOCK_FOUND and fixes up the symbol's section
- if necessary. */
+ Upon success fixes up the symbol's section if necessary. */
-extern struct symbol *lookup_global_symbol (const char *name,
- const struct block *block,
- const domain_enum domain);
+extern struct block_symbol
+ lookup_global_symbol (const char *name,
+ const struct block *block,
+ const domain_enum domain);
/* Lookup a symbol in block BLOCK.
- Upon success sets BLOCK_FOUND and fixes up the symbol's section
- if necessary. */
+ Upon success fixes up the symbol's section if necessary. */
-extern struct symbol *lookup_symbol_in_block (const char *name,
- const struct block *block,
- const domain_enum domain);
+extern struct symbol *
+ lookup_symbol_in_block (const char *name,
+ const struct block *block,
+ const domain_enum domain);
/* Look up the `this' symbol for LANG in BLOCK. Return the symbol if
found, or NULL if not found. */
-extern struct symbol *lookup_language_this (const struct language_defn *lang,
- const struct block *block);
+extern struct block_symbol
+ lookup_language_this (const struct language_defn *lang,
+ const struct block *block);
/* Lookup a [struct, union, enum] by name, within a specified block. */
/* Flags passed as 4th argument to print_source_lines. */
-enum print_source_lines_flags
+enum print_source_lines_flag
{
/* Do not print an error message. */
PRINT_SOURCE_LINES_NOERROR = (1 << 0),
/* Print the filename in front of the source lines. */
PRINT_SOURCE_LINES_FILENAME = (1 << 1)
};
+DEF_ENUM_FLAGS_TYPE (enum print_source_lines_flag, print_source_lines_flags);
extern void print_source_lines (struct symtab *, int, int,
- enum print_source_lines_flags);
+ print_source_lines_flags);
extern void forget_cached_source_info_for_objfile (struct objfile *);
extern void forget_cached_source_info (void);
/* Lookup symbol NAME from DOMAIN in MAIN_OBJFILE's global blocks.
This searches MAIN_OBJFILE as well as any associated separate debug info
objfiles of MAIN_OBJFILE.
- Upon success sets BLOCK_FOUND and fixes up the symbol's section
- if necessary. */
+ Upon success fixes up the symbol's section if necessary. */
-extern struct symbol *
+extern struct block_symbol
lookup_global_symbol_from_objfile (struct objfile *main_objfile,
const char *name,
const domain_enum domain);
void *data),
void *data);
-DEF_VEC_I (CORE_ADDR);
-
VEC (CORE_ADDR) *find_pcs_for_symtab_line (struct symtab *symtab, int line,
struct linetable_entry **best_entry);
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