/* Symbol table definitions for GDB.
- Copyright (C) 1986, 1988-2004, 2007-2012 Free Software Foundation,
- Inc.
+ Copyright (C) 1986-2014 Free Software Foundation, Inc.
This file is part of GDB.
#define SYMTAB_H 1
#include "vec.h"
+#include "gdb_vecs.h"
+#include "gdbtypes.h"
/* Opaque declarations. */
struct ui_file;
struct program_space;
struct language_defn;
struct probe;
+struct common_block;
/* Some of the structures in this file are space critical.
The space-critical structures are:
{
LONGEST ivalue;
- struct block *block;
+ const struct block *block;
- gdb_byte *bytes;
+ const gdb_byte *bytes;
CORE_ADDR address;
+ /* A common block. Used with LOC_COMMON_BLOCK. */
+
+ const struct common_block *common_block;
+
/* For opaque typedef struct chain. */
struct symbol *chain;
union
{
+ /* A pointer to an obstack that can be used for storage associated
+ with this symbol. This is only used by Ada, and only when the
+ 'ada_mangled' field is zero. */
+ struct obstack *obstack;
+
/* This is used by languages which wish to store a demangled name.
currently used by Ada, Java, and Objective C. */
struct mangled_lang
ENUM_BITFIELD(language) language : 8;
+ /* This is only used by Ada. If set, then the 'mangled_lang' field
+ of language_specific is valid. Otherwise, the 'obstack' field is
+ valid. */
+ unsigned int ada_mangled : 1;
+
/* Which section is this symbol in? This is an index into
section_offsets for this objfile. Negative means that the symbol
- does not get relocated relative to a section.
- Disclaimer: currently this is just used for xcoff, so don't
- expect all symbol-reading code to set it correctly (the ELF code
- also tries to set it correctly). */
+ does not get relocated relative to a section. */
short section;
-
- /* The section associated with this symbol. It can be NULL. */
-
- struct obj_section *obj_section;
};
-extern void symbol_set_demangled_name (struct general_symbol_info *, char *,
- struct objfile *);
+extern void symbol_set_demangled_name (struct general_symbol_info *,
+ const char *,
+ struct obstack *);
extern const char *symbol_get_demangled_name
(const struct general_symbol_info *);
extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
/* Note that all the following SYMBOL_* macros are used with the
- SYMBOL argument being either a partial symbol, a minimal symbol or
- a full symbol. All three types have a ginfo field. In particular
+ SYMBOL argument being either a partial symbol or
+ a full symbol. Both types have a ginfo field. In particular
the SYMBOL_SET_LANGUAGE, SYMBOL_DEMANGLED_NAME, etc.
macros cannot be entirely substituted by
functions, unless the callers are changed to pass in the ginfo
#define SYMBOL_VALUE(symbol) (symbol)->ginfo.value.ivalue
#define SYMBOL_VALUE_ADDRESS(symbol) (symbol)->ginfo.value.address
#define SYMBOL_VALUE_BYTES(symbol) (symbol)->ginfo.value.bytes
+#define SYMBOL_VALUE_COMMON_BLOCK(symbol) (symbol)->ginfo.value.common_block
#define SYMBOL_BLOCK_VALUE(symbol) (symbol)->ginfo.value.block
#define SYMBOL_VALUE_CHAIN(symbol) (symbol)->ginfo.value.chain
#define SYMBOL_LANGUAGE(symbol) (symbol)->ginfo.language
#define SYMBOL_SECTION(symbol) (symbol)->ginfo.section
-#define SYMBOL_OBJ_SECTION(symbol) (symbol)->ginfo.obj_section
+#define SYMBOL_OBJ_SECTION(objfile, symbol) \
+ (((symbol)->ginfo.section >= 0) \
+ ? (&(((objfile)->sections)[(symbol)->ginfo.section])) \
+ : NULL)
/* Initializes the language dependent portion of a symbol
depending upon the language for the symbol. */
-#define SYMBOL_SET_LANGUAGE(symbol,language) \
- (symbol_set_language (&(symbol)->ginfo, (language)))
+#define SYMBOL_SET_LANGUAGE(symbol,language,obstack) \
+ (symbol_set_language (&(symbol)->ginfo, (language), (obstack)))
extern void symbol_set_language (struct general_symbol_info *symbol,
- enum language language);
+ enum language language,
+ struct obstack *obstack);
/* Set just the linkage name of a symbol; do not try to demangle
it. Used for constructs which do not have a mangled name,
extern int demangle;
/* Macro that returns the name to be used when sorting and searching symbols.
- In C++, Chill, and Java, we search for the demangled form of a name,
+ In C++ and Java, we search for the demangled form of a name,
and so sort symbols accordingly. In Ada, however, we search by mangled
name. If there is no distinct demangled name, then SYMBOL_SEARCH_NAME
returns the same value (same pointer) as SYMBOL_LINKAGE_NAME. */
The SYMBOL_VALUE_ADDRESS contains the address that this symbol
corresponds to. */
- struct general_symbol_info ginfo;
+ struct general_symbol_info mginfo;
/* Size of this symbol. end_psymtab in dbxread.c uses this
information to calculate the end of the partial symtab based on the
ENUM_BITFIELD(minimal_symbol_type) type : 8;
+ /* Non-zero if this symbol was created by gdb.
+ Such symbols do not appear in the output of "info var|fun". */
+ unsigned int created_by_gdb : 1;
+
/* Two flag bits provided for the use of the target. */
unsigned int target_flag_1 : 1;
unsigned int target_flag_2 : 1;
+ /* Nonzero iff the size of the minimal symbol has been set.
+ Symbol size information can sometimes not be determined, because
+ the object file format may not carry that piece of information. */
+ unsigned int has_size : 1;
+
/* Minimal symbols with the same hash key are kept on a linked
list. This is the link. */
#define MSYMBOL_TARGET_FLAG_1(msymbol) (msymbol)->target_flag_1
#define MSYMBOL_TARGET_FLAG_2(msymbol) (msymbol)->target_flag_2
-#define MSYMBOL_SIZE(msymbol) (msymbol)->size
+#define MSYMBOL_SIZE(msymbol) ((msymbol)->size + 0)
+#define SET_MSYMBOL_SIZE(msymbol, sz) \
+ do \
+ { \
+ (msymbol)->size = sz; \
+ (msymbol)->has_size = 1; \
+ } while (0)
+#define MSYMBOL_HAS_SIZE(msymbol) ((msymbol)->has_size + 0)
#define MSYMBOL_TYPE(msymbol) (msymbol)->type
+#define MSYMBOL_VALUE(symbol) (symbol)->mginfo.value.ivalue
+/* The unrelocated address of the minimal symbol. */
+#define MSYMBOL_VALUE_RAW_ADDRESS(symbol) ((symbol)->mginfo.value.address + 0)
+/* The relocated address of the minimal symbol, using the section
+ offsets from OBJFILE. */
+#define MSYMBOL_VALUE_ADDRESS(objfile, symbol) \
+ ((symbol)->mginfo.value.address \
+ + ANOFFSET ((objfile)->section_offsets, ((symbol)->mginfo.section)))
+/* For a bound minsym, we can easily compute the address directly. */
+#define BMSYMBOL_VALUE_ADDRESS(symbol) \
+ MSYMBOL_VALUE_ADDRESS ((symbol).objfile, (symbol).minsym)
+#define SET_MSYMBOL_VALUE_ADDRESS(symbol, new_value) \
+ ((symbol)->mginfo.value.address = (new_value))
+#define MSYMBOL_VALUE_BYTES(symbol) (symbol)->mginfo.value.bytes
+#define MSYMBOL_BLOCK_VALUE(symbol) (symbol)->mginfo.value.block
+#define MSYMBOL_VALUE_CHAIN(symbol) (symbol)->mginfo.value.chain
+#define MSYMBOL_LANGUAGE(symbol) (symbol)->mginfo.language
+#define MSYMBOL_SECTION(symbol) (symbol)->mginfo.section
+#define MSYMBOL_OBJ_SECTION(objfile, symbol) \
+ (((symbol)->mginfo.section >= 0) \
+ ? (&(((objfile)->sections)[(symbol)->mginfo.section])) \
+ : NULL)
+
+#define MSYMBOL_NATURAL_NAME(symbol) \
+ (symbol_natural_name (&(symbol)->mginfo))
+#define MSYMBOL_LINKAGE_NAME(symbol) (symbol)->mginfo.name
+#define MSYMBOL_PRINT_NAME(symbol) \
+ (demangle ? MSYMBOL_NATURAL_NAME (symbol) : MSYMBOL_LINKAGE_NAME (symbol))
+#define MSYMBOL_DEMANGLED_NAME(symbol) \
+ (symbol_demangled_name (&(symbol)->mginfo))
+#define MSYMBOL_SET_LANGUAGE(symbol,language,obstack) \
+ (symbol_set_language (&(symbol)->mginfo, (language), (obstack)))
+#define MSYMBOL_SEARCH_NAME(symbol) \
+ (symbol_search_name (&(symbol)->mginfo))
+#define MSYMBOL_MATCHES_SEARCH_NAME(symbol, name) \
+ (strcmp_iw (MSYMBOL_SEARCH_NAME (symbol), (name)) == 0)
+#define MSYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile) \
+ symbol_set_names (&(symbol)->mginfo, linkage_name, len, copy_name, objfile)
+
#include "minsyms.h"
\f
STRUCT_DOMAIN,
+ /* MODULE_DOMAIN is used in Fortran to hold module type names. */
+
+ MODULE_DOMAIN,
+
/* LABEL_DOMAIN may be used for names of labels (for gotos). */
- LABEL_DOMAIN
+ LABEL_DOMAIN,
+
+ /* Fortran common blocks. Their naming must be separate from VAR_DOMAIN.
+ They also always use LOC_COMMON_BLOCK. */
+ COMMON_BLOCK_DOMAIN
} domain_enum;
+extern const char *domain_name (domain_enum);
+
/* Searching domains, used for `search_symbols'. Element numbers are
hardcoded in GDB, check all enum uses before changing it. */
ALL_DOMAIN = 3
};
+extern const char *search_domain_name (enum search_domain);
+
/* An address-class says where to find the value of a symbol. */
enum address_class
/* The variable's address is computed by a set of location
functions (see "struct symbol_computed_ops" below). */
LOC_COMPUTED,
+
+ /* The variable uses general_symbol_info->value->common_block field.
+ It also always uses COMMON_BLOCK_DOMAIN. */
+ LOC_COMMON_BLOCK,
+
+ /* Not used, just notes the boundary of the enum. */
+ LOC_FINAL_VALUE
};
/* The methods needed to implement LOC_COMPUTED. These methods can
void (*describe_location) (struct symbol * symbol, CORE_ADDR addr,
struct ui_file * stream);
+ /* Non-zero if this symbol's address computation is dependent on PC. */
+ unsigned char location_has_loclist;
+
/* Tracepoint support. Append bytecodes to the tracepoint agent
expression AX that push the address of the object SYMBOL. Set
VALUE appropriately. Note --- for objects in registers, this
struct agent_expr *ax, struct axs_value *value);
};
+/* The methods needed to implement LOC_BLOCK for inferior functions.
+ These methods can use the symbol's .aux_value for additional
+ per-symbol information. */
+
+struct symbol_block_ops
+{
+ /* Fill in *START and *LENGTH with DWARF block data of function
+ FRAMEFUNC valid for inferior context address PC. Set *LENGTH to
+ zero if such location is not valid for PC; *START is left
+ uninitialized in such case. */
+ void (*find_frame_base_location) (struct symbol *framefunc, CORE_ADDR pc,
+ const gdb_byte **start, size_t *length);
+};
+
/* Functions used with LOC_REGISTER and LOC_REGPARM_ADDR. */
struct symbol_register_ops
int (*register_number) (struct symbol *symbol, struct gdbarch *gdbarch);
};
+/* Objects of this type are used to find the address class and the
+ various computed ops vectors of a symbol. */
+
+struct symbol_impl
+{
+ enum address_class aclass;
+
+ /* Used with LOC_COMPUTED. */
+ const struct symbol_computed_ops *ops_computed;
+
+ /* Used with LOC_BLOCK. */
+ const struct symbol_block_ops *ops_block;
+
+ /* 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
ENUM_BITFIELD(domain_enum_tag) domain : 6;
- /* Address class */
- /* NOTE: cagney/2003-11-02: The fields "aclass" and "ops" contain
- overlapping information. By creating a per-aclass ops vector, or
- using the aclass as an index into an ops table, the aclass and
- ops fields can be merged. The latter, for instance, would shave
- 32-bits from each symbol (relative to a symbol lookup, any table
- index overhead would be in the noise). */
+ /* Address class. This holds an index into the 'symbol_impls'
+ table. The actual enum address_class value is stored there,
+ alongside any per-class ops vectors. */
- ENUM_BITFIELD(address_class) aclass : 6;
+ unsigned int aclass_index : SYMBOL_ACLASS_BITS;
/* Whether this is an argument. */
unsigned short line;
- /* Method's for symbol's of this class. */
- /* NOTE: cagney/2003-11-02: See comment above attached to "aclass". */
-
- union
- {
- /* Used with LOC_COMPUTED. */
- const struct symbol_computed_ops *ops_computed;
-
- /* Used with LOC_REGISTER and LOC_REGPARM_ADDR. */
- const struct symbol_register_ops *ops_register;
- } ops;
-
/* 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. */
struct symbol *hash_next;
};
+extern const struct symbol_impl *symbol_impls;
#define SYMBOL_DOMAIN(symbol) (symbol)->domain
-#define SYMBOL_CLASS(symbol) (symbol)->aclass
+#define SYMBOL_IMPL(symbol) (symbol_impls[(symbol)->aclass_index])
+#define SYMBOL_ACLASS_INDEX(symbol) (symbol)->aclass_index
+#define SYMBOL_CLASS(symbol) (SYMBOL_IMPL (symbol).aclass)
#define SYMBOL_IS_ARGUMENT(symbol) (symbol)->is_argument
#define SYMBOL_INLINED(symbol) (symbol)->is_inlined
#define SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION(symbol) \
#define SYMBOL_TYPE(symbol) (symbol)->type
#define SYMBOL_LINE(symbol) (symbol)->line
#define SYMBOL_SYMTAB(symbol) (symbol)->symtab
-#define SYMBOL_COMPUTED_OPS(symbol) (symbol)->ops.ops_computed
-#define SYMBOL_REGISTER_OPS(symbol) (symbol)->ops.ops_register
+#define SYMBOL_COMPUTED_OPS(symbol) (SYMBOL_IMPL (symbol).ops_computed)
+#define SYMBOL_BLOCK_OPS(symbol) (SYMBOL_IMPL (symbol).ops_block)
+#define SYMBOL_REGISTER_OPS(symbol) (SYMBOL_IMPL (symbol).ops_register)
#define SYMBOL_LOCATION_BATON(symbol) (symbol)->aux_value
+#define SYMBOL_OBJFILE(symbol) (SYMBOL_SYMTAB (symbol)->objfile)
+
+extern int register_symbol_computed_impl (enum address_class,
+ const struct symbol_computed_ops *);
+
+extern int register_symbol_block_impl (enum address_class aclass,
+ const struct symbol_block_ops *ops);
+
+extern int register_symbol_register_impl (enum address_class,
+ const struct symbol_register_ops *);
/* An instance of this type is used to represent a C++ template
function. It includes a "struct symbol" as a kind of base class;
between different symtabs (and normally is for all the symtabs
in a given compilation unit). */
- struct blockvector *blockvector;
+ const struct blockvector *blockvector;
/* Table mapping core addresses to line numbers for this file.
Can be NULL if none. Never shared between different symtabs. */
all the symtabs in a given compilation unit. */
struct macro_table *macro_table;
- /* Name of this source file. */
+ /* Name of this source file. This pointer is never NULL. */
- char *filename;
+ const char *filename;
/* Directory in which it was compiled, or NULL if we don't know. */
- char *dirname;
+ const char *dirname;
/* Total number of lines found in source file. */
#define BLOCKVECTOR(symtab) (symtab)->blockvector
#define LINETABLE(symtab) (symtab)->linetable
#define SYMTAB_PSPACE(symtab) (symtab)->objfile->pspace
+
+/* Call this to set the "primary" field in struct symtab. */
+extern void set_symtab_primary (struct symtab *, int primary);
+
+typedef struct symtab *symtab_ptr;
+DEF_VEC_P (symtab_ptr);
+
\f
/* The virtual function table is now an array of structures which have the
extern struct symtab *lookup_symtab (const char *);
+/* An object of this type is passed as the 'is_a_field_of_this'
+ argument to lookup_symbol and lookup_symbol_in_language. */
+
+struct field_of_this_result
+{
+ /* The type in which the field was found. If this is NULL then the
+ symbol was not found in 'this'. If non-NULL, then one of the
+ other fields will be non-NULL as well. */
+
+ struct type *type;
+
+ /* If the symbol was found as an ordinary field of 'this', then this
+ is non-NULL and points to the particular field. */
+
+ struct field *field;
+
+ /* If the symbol was found as an function field of 'this', then this
+ is non-NULL and points to the particular field. */
+
+ struct fn_fieldlist *fn_field;
+};
+
/* lookup a symbol by name (optional block) in language. */
extern struct symbol *lookup_symbol_in_language (const char *,
const struct block *,
const domain_enum,
enum language,
- int *);
+ struct field_of_this_result *);
/* lookup a symbol by name (optional block, optional symtab)
in the current language. */
extern struct symbol *lookup_symbol (const char *, const struct block *,
- const domain_enum, int *);
+ 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. */
/* lookup a [struct, union, enum] by name, within a specified block. */
-extern struct type *lookup_struct (const char *, struct block *);
+extern struct type *lookup_struct (const char *, const struct block *);
-extern struct type *lookup_union (const char *, struct block *);
+extern struct type *lookup_union (const char *, const struct block *);
-extern struct type *lookup_enum (const char *, struct block *);
+extern struct type *lookup_enum (const char *, const struct block *);
/* from blockframe.c: */
/* The probe associated with this symtab_and_line. */
struct probe *probe;
+ /* If PROBE is not NULL, then this is the objfile in which the probe
+ originated. */
+ struct objfile *objfile;
};
extern void init_sal (struct symtab_and_line *sal);
};
\f
-
-/* Some types and macros needed for exception catchpoints.
- Can't put these in target.h because symtab_and_line isn't
- known there. This file will be included by breakpoint.c,
- hppa-tdep.c, etc. */
-
-/* Enums for exception-handling support. */
-enum exception_event_kind
-{
- EX_EVENT_THROW,
- EX_EVENT_CATCH
-};
-
-\f
-
/* Given a pc value, return line number it is in. Second arg nonzero means
if pc is on the boundary use the previous statement's line number. */
extern void resolve_sal_pc (struct symtab_and_line *);
-/* Given a string, return the line specified by it. For commands like "list"
- and "breakpoint". */
-
-extern struct symtabs_and_lines decode_line_spec (char *, int);
-
-extern struct symtabs_and_lines decode_line_spec_1 (char *, int);
-
-/* Symmisc.c */
-
-void maintenance_print_symbols (char *, int);
-
-void maintenance_print_psymbols (char *, int);
-
-void maintenance_print_msymbols (char *, int);
-
-void maintenance_print_objfiles (char *, int);
-
-void maintenance_info_symtabs (char *, int);
-
-void maintenance_info_psymtabs (char *, int);
-
-void maintenance_check_symtabs (char *, int);
-
-/* maint.c */
-
-void maintenance_print_statistics (char *, int);
-
/* Symbol-reading stuff in symfile.c and solib.c. */
extern void clear_solib (void);
extern int identify_source_line (struct symtab *, int, int, CORE_ADDR);
-extern void print_source_lines (struct symtab *, int, int, int);
+/* Flags passed as 4th argument to print_source_lines. */
+
+enum print_source_lines_flags
+ {
+ /* 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)
+ };
+
+extern void print_source_lines (struct symtab *, int, int,
+ enum print_source_lines_flags);
extern void forget_cached_source_info_for_objfile (struct objfile *);
extern void forget_cached_source_info (void);
extern void select_source_symtab (struct symtab *);
-extern char **default_make_symbol_completion_list_break_on
- (char *text, char *word, const char *break_on);
-extern char **default_make_symbol_completion_list (char *, char *);
-extern char **make_symbol_completion_list (char *, char *);
-extern char **make_symbol_completion_list_fn (struct cmd_list_element *,
- char *, char *);
-
-extern char **make_file_symbol_completion_list (char *, char *, char *);
-
-extern char **make_source_files_completion_list (char *, char *);
+extern VEC (char_ptr) *default_make_symbol_completion_list_break_on
+ (const char *text, const char *word, const char *break_on,
+ enum type_code code);
+extern VEC (char_ptr) *default_make_symbol_completion_list (const char *,
+ const char *,
+ enum type_code);
+extern VEC (char_ptr) *make_symbol_completion_list (const char *, const char *);
+extern VEC (char_ptr) *make_symbol_completion_type (const char *, const char *,
+ enum type_code);
+extern VEC (char_ptr) *make_symbol_completion_list_fn (struct cmd_list_element *,
+ const char *,
+ const char *);
+
+extern VEC (char_ptr) *make_file_symbol_completion_list (const char *,
+ const char *,
+ const char *);
+
+extern VEC (char_ptr) *make_source_files_completion_list (const char *,
+ const char *);
/* symtab.c */
int matching_obj_sections (struct obj_section *, struct obj_section *);
-extern const char *find_main_filename (void);
-
extern struct symtab *find_line_symtab (struct symtab *, int, int *, int *);
extern struct symtab_and_line find_function_start_sal (struct symbol *sym,
struct objfile *);
/* Symbol searching */
+/* Note: struct symbol_search, search_symbols, et.al. are declared here,
+ instead of making them local to symtab.c, for gdbtk's sake. */
/* When using search_symbols, a list of the following structs is returned.
Callers must free the search list using free_search_symbols! */
/* Information describing what was found.
- If symtab abd symbol are NOT NULL, then information was found
+ If symtab and symbol are NOT NULL, then information was found
for this match. */
struct symtab *symtab;
struct symbol *symbol;
/* If msymbol is non-null, then a match was made on something for
which only minimal_symbols exist. */
- struct minimal_symbol *msymbol;
+ struct bound_minimal_symbol msymbol;
/* A link to the next match, or NULL for the end. */
struct symbol_search *next;
};
-extern void search_symbols (char *, enum search_domain, int, char **,
- struct symbol_search **);
+extern void search_symbols (const char *, enum search_domain, int,
+ const char **, struct symbol_search **);
extern void free_search_symbols (struct symbol_search *);
extern struct cleanup *make_cleanup_free_search_symbols (struct symbol_search
- *);
+ **);
/* The name of the ``main'' function.
FIXME: cagney/2001-03-20: Can't make main_name() const since some
of the calling code currently assumes that the string isn't
const. */
-extern void set_main_name (const char *name);
extern /*const */ char *main_name (void);
-extern enum language language_of_main;
+extern enum language main_language (void);
/* Check global symbols in objfile. */
struct symbol *lookup_global_symbol_from_objfile (const struct objfile *,
struct objfile *lookup_objfile_from_block (const struct block *block);
+extern unsigned int symtab_create_debug;
+
extern int basenames_may_differ;
int compare_filenames_for_search (const char *filename,
- const char *search_name,
- int search_len);
+ const char *search_name);
int iterate_over_some_symtabs (const char *name,
- const char *full_path,
const char *real_path,
int (*callback) (struct symtab *symtab,
void *data),
struct cleanup *demangle_for_lookup (const char *name, enum language lang,
const char **result_name);
+struct symbol *allocate_symbol (struct objfile *);
+
+void initialize_symbol (struct symbol *);
+
+struct template_symbol *allocate_template_symbol (struct objfile *);
+
#endif /* !defined(SYMTAB_H) */
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