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binutils-gdb/gdb/c-lang.c
Pedro Alves 2f408ecb92 Use ui_file_as_string throughout more 
This replaces most of the remaining ui_file_xstrdup calls with
ui_file_as_string calls.  Whenever a call was replaced, that led to a
cascade of other necessary adjustments throughout, to make the code
use std::string instead of raw pointers.  And then whenever I added a
std::string as member of a struct, I needed to adjust
allocation/destruction of said struct to use new/delete instead of
xmalloc/xfree.

The stopping point was once gdb built again.  These doesn't seem to be
a way to reasonably split this out further.

Maybe-not-obvious changes:

 - demangle_for_lookup returns a cleanup today.  To get rid of that,
   and avoid unnecessary string dupping/copying, this introduces a
   demangle_result_storage type that the caller instantiates and
   passes to demangle_for_lookup.

 - Many methods returned a "char *" to indicate that the caller owns
   the memory and must free it.  Those are switched to return a
   std::string instead.  Methods that return a "view" into some
   internal string return a "const char *" instead.  I.e., we only
   copy/allocate when necessary.

gdb/ChangeLog:
2016-11-08  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (ada_name_for_lookup, type_as_string): Use and return
	std::string.
	(type_as_string_and_cleanup): Delete.
	(ada_lookup_struct_elt_type): Use type_as_string.
	* ada-lang.h (ada_name_for_lookup): Now returns std::string.
	* ada-varobj.c (ada_varobj_scalar_image): Return a std::string.
	(ada_varobj_describe_child): Make 'child_name' and
	'child_path_expr' parameters std::string pointers.
	(ada_varobj_describe_struct_child, ada_varobj_describe_ptr_child):
	Likewise, and use string_printf.
	(ada_varobj_describe_simple_array_child)
	(ada_varobj_describe_child): Likewise.
	(ada_varobj_get_name_of_child, ada_varobj_get_path_expr_of_child)
	(ada_varobj_get_value_image)
	(ada_varobj_get_value_of_array_variable)
	(ada_varobj_get_value_of_variable, ada_name_of_variable)
	(ada_name_of_child, ada_path_expr_of_child)
	(ada_value_of_variable): Now returns std::string.  Use
	string_printf.
	(ada_value_of_child): Adjust.
	* break-catch-throw.c (check_status_exception_catchpoint): Adjust
	to use std::string.
	* breakpoint.c (watch_command_1): Adjust to use std::string.
	* c-lang.c (c_get_string): Adjust to use std::string.
	* c-typeprint.c (print_name_maybe_canonical): Use std::string.
	* c-varobj.c (varobj_is_anonymous_child): Use ==/!= std::string
	operators.
	(c_name_of_variable): Now returns a std::string.
	(c_describe_child): The 'cname' and 'cfull_expression' output
	parameters are now std::string pointers.  Adjust.
	(c_name_of_child, c_path_expr_of_child, c_value_of_variable)
	(cplus_number_of_children): Adjust to use std::string and
	string_printf.
	(cplus_name_of_variable): Now returns a std::string.
	(cplus_describe_child): The 'cname' and 'cfull_expression' output
	parameters are now std::string pointers.  Adjust.
	(cplus_name_of_child, cplus_path_expr_of_child)
	(cplus_value_of_variable): Now returns a std::string.
	* cp-abi.c (cplus_typename_from_type_info): Return std::string.
	* cp-abi.h (cplus_typename_from_type_info): Return std::string.
	(struct cp_abi_ops) <get_typename_from_type_info>: Return
	std::string.
	* cp-support.c (inspect_type): Use std::string.
	(cp_canonicalize_string_full, cp_canonicalize_string_no_typedefs)
	(cp_canonicalize_string): Return std::string and adjust.
	* cp-support.h (cp_canonicalize_string)
	(cp_canonicalize_string_no_typedefs, cp_canonicalize_string_full):
	Return std::string.
	* dbxread.c (read_dbx_symtab): Use std::string.
	* dwarf2read.c (dwarf2_canonicalize_name): Adjust to use std::string.
	* gdbcmd.h (lookup_struct_elt_type): Adjust to use std::string.
	* gnu-v3-abi.c (gnuv3_get_typeid): Use std::string.
	(gnuv3_get_typename_from_type_info): Return a std::string and
	adjust.
	(gnuv3_get_type_from_type_info): Adjust to use std::string.
	* guile/guile.c (gdbscm_execute_gdb_command): Adjust to use
	std::string.
	* infcmd.c (print_return_value_1): Adjust to use std::string.
	* linespec.c (find_linespec_symbols): Adjust to
	demangle_for_lookup API change.  Use std::string.
	* mi/mi-cmd-var.c (print_varobj, mi_cmd_var_set_format)
	(mi_cmd_var_info_type, mi_cmd_var_info_path_expression)
	(mi_cmd_var_info_expression, mi_cmd_var_evaluate_expression)
	(mi_cmd_var_assign, varobj_update_one): Adjust to use std::string.
	* minsyms.c (lookup_minimal_symbol): Use std::string.
	* python/py-varobj.c (py_varobj_iter_next): Use new instead of
	XNEW.  vitem->name is a std::string now, adjust.
	* rust-exp.y (convert_ast_to_type, convert_name): Adjust to use
	std::string.
	* stabsread.c (define_symbol): Adjust to use std::string.
	* symtab.c (demangle_for_lookup): Now returns 'const char *'.  Add
	a demangle_result_storage parameter.  Use it for storage.
	(lookup_symbol_in_language)
	(lookup_symbol_in_objfile_from_linkage_name): Adjust to new
	demangle_for_lookup API.
	* symtab.h (struct demangle_result_storage): New type.
	(demangle_for_lookup): Now returns 'const char *'.  Add a
	demangle_result_storage parameter.
	* typeprint.c (type_to_string): Return std::string and use
	ui_file_as_string.
	* value.h (type_to_string): Change return type to std::string.
	* varobj-iter.h (struct varobj_item) <name>: Now a std::string.
	(varobj_iter_delete): Use delete instead of xfree.
	* varobj.c (create_child): Return std::string instead of char * in
	output parameter.
	(name_of_variable, name_of_child, my_value_of_variable): Return
	std::string instead of char *.
	(varobj_create, varobj_get_handle): Constify 'objname' parameter.
	Adjust to std::string fields.
	(varobj_get_objname): Return a const char * instead of a char *.
	(varobj_get_expression): Return a std::string.
	(varobj_list_children): Adjust to use std::string.
	(varobj_get_type): Return a std::string.
	(varobj_get_path_expr): Return a const char * instead of a char *.
	Adjust to std::string fields.
	(varobj_get_formatted_value, varobj_get_value): Return a
	std::string.
	(varobj_set_value): Change type of 'expression' parameter to
	std::string.  Use std::string.
	(install_new_value): Use std::string.
	(delete_variable_1): Adjust to use std::string.
	(create_child): Change the 'name' parameter to a std::string
	reference.  Swap it into the new item's name.
	(create_child_with_value): Swap item's name into the new child's
	name.  Use string_printf.
	(new_variable): Use new instead of XNEW.
	(free_variable): Don't xfree fields that are now std::string.
	(name_of_variable, name_of_child): Now returns std::string.
	(value_of_root): Adjust to use std::string.
	(my_value_of_variable, varobj_value_get_print_value): Return
	and use std::string.
	(varobj_value_get_print_value): Adjust to use ui_file_as_string
	and std::string.
	* varobj.h (struct varobj) <name, path_expr, obj_name,
	print_value>: Now std::string's.
	<name_of_variable, name_of_child, path_expr_of_child,
	value_of_variable>: Return std::string.
	(varobj_create, varobj_get_handle): Constify 'objname' parameter.
	(varobj_get_objname): Return a const char * instead of a char *.
	(varobj_get_expression, varobj_get_type): Return a std::string.
	(varobj_get_path_expr): Return a const char * instead of a char *.
	(varobj_get_formatted_value, varobj_get_value): Return a
	std::string.
	(varobj_set_value): Constify 'expression' parameter.
	(varobj_value_get_print_value): Return a std::string.
2016-11-08 15:26:47 +00:00

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/* C language support routines for GDB, the GNU debugger.
Copyright (C) 1992-2016 Free Software Foundation, Inc.
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/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "c-lang.h"
#include "valprint.h"
#include "macroscope.h"
#include "charset.h"
#include "demangle.h"
#include "cp-abi.h"
#include "cp-support.h"
#include "gdb_obstack.h"
#include <ctype.h>
#include "gdbcore.h"
extern void _initialize_c_language (void);
/* Given a C string type, STR_TYPE, return the corresponding target
character set name. */
static const char *
charset_for_string_type (c_string_type str_type, struct gdbarch *gdbarch)
{
switch (str_type & ~C_CHAR)
{
case C_STRING:
return target_charset (gdbarch);
case C_WIDE_STRING:
return target_wide_charset (gdbarch);
case C_STRING_16:
/* FIXME: UTF-16 is not always correct. */
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
return "UTF-16BE";
else
return "UTF-16LE";
case C_STRING_32:
/* FIXME: UTF-32 is not always correct. */
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
return "UTF-32BE";
else
return "UTF-32LE";
}
internal_error (__FILE__, __LINE__, _("unhandled c_string_type"));
}
/* Classify ELTTYPE according to what kind of character it is. Return
the enum constant representing the character type. Also set
*ENCODING to the name of the character set to use when converting
characters of this type in target BYTE_ORDER to the host character
set. */
static c_string_type
classify_type (struct type *elttype, struct gdbarch *gdbarch,
const char **encoding)
{
c_string_type result;
/* We loop because ELTTYPE may be a typedef, and we want to
successively peel each typedef until we reach a type we
understand. We don't use CHECK_TYPEDEF because that will strip
all typedefs at once -- but in C, wchar_t is itself a typedef, so
that would do the wrong thing. */
while (elttype)
{
const char *name = TYPE_NAME (elttype);
if (TYPE_CODE (elttype) == TYPE_CODE_CHAR || !name)
{
result = C_CHAR;
goto done;
}
if (!strcmp (name, "wchar_t"))
{
result = C_WIDE_CHAR;
goto done;
}
if (!strcmp (name, "char16_t"))
{
result = C_CHAR_16;
goto done;
}
if (!strcmp (name, "char32_t"))
{
result = C_CHAR_32;
goto done;
}
if (TYPE_CODE (elttype) != TYPE_CODE_TYPEDEF)
break;
/* Call for side effects. */
check_typedef (elttype);
if (TYPE_TARGET_TYPE (elttype))
elttype = TYPE_TARGET_TYPE (elttype);
else
{
/* Perhaps check_typedef did not update the target type. In
this case, force the lookup again and hope it works out.
It never will for C, but it might for C++. */
elttype = check_typedef (elttype);
}
}
/* Punt. */
result = C_CHAR;
done:
if (encoding)
*encoding = charset_for_string_type (result, gdbarch);
return result;
}
/* Print the character C on STREAM as part of the contents of a
literal string whose delimiter is QUOTER. Note that that format
for printing characters and strings is language specific. */
void
c_emit_char (int c, struct type *type,
struct ui_file *stream, int quoter)
{
const char *encoding;
classify_type (type, get_type_arch (type), &encoding);
generic_emit_char (c, type, stream, quoter, encoding);
}
void
c_printchar (int c, struct type *type, struct ui_file *stream)
{
c_string_type str_type;
str_type = classify_type (type, get_type_arch (type), NULL);
switch (str_type)
{
case C_CHAR:
break;
case C_WIDE_CHAR:
fputc_filtered ('L', stream);
break;
case C_CHAR_16:
fputc_filtered ('u', stream);
break;
case C_CHAR_32:
fputc_filtered ('U', stream);
break;
}
fputc_filtered ('\'', stream);
LA_EMIT_CHAR (c, type, stream, '\'');
fputc_filtered ('\'', stream);
}
/* Print the character string STRING, printing at most LENGTH
characters. LENGTH is -1 if the string is nul terminated. Each
character is WIDTH bytes long. 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. */
void
c_printstr (struct ui_file *stream, struct type *type,
const gdb_byte *string, unsigned int length,
const char *user_encoding, int force_ellipses,
const struct value_print_options *options)
{
c_string_type str_type;
const char *type_encoding;
const char *encoding;
str_type = (classify_type (type, get_type_arch (type), &type_encoding)
& ~C_CHAR);
switch (str_type)
{
case C_STRING:
break;
case C_WIDE_STRING:
fputs_filtered ("L", stream);
break;
case C_STRING_16:
fputs_filtered ("u", stream);
break;
case C_STRING_32:
fputs_filtered ("U", stream);
break;
}
encoding = (user_encoding && *user_encoding) ? user_encoding : type_encoding;
generic_printstr (stream, type, string, length, encoding, force_ellipses,
'"', 1, options);
}
/* Obtain a C 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. The size
of a character is determined by the length of the target type of
the pointer or array.
If VALUE is an array with a known length, and *LENGTH is -1,
the function will not read past the end of the array. However, any
declared size of the array is ignored if *LENGTH > 0.
On completion, *LENGTH will be set to the size of the string read in
characters. (If a length of -1 is specified, the length returned
will not include the null character). CHARSET is always set to the
target charset. */
void
c_get_string (struct value *value, gdb_byte **buffer,
int *length, struct type **char_type,
const char **charset)
{
int err, width;
unsigned int fetchlimit;
struct type *type = check_typedef (value_type (value));
struct type *element_type = TYPE_TARGET_TYPE (type);
int req_length = *length;
enum bfd_endian byte_order
= gdbarch_byte_order (get_type_arch (type));
if (element_type == NULL)
goto error;
if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
/* If we know the size of the array, we can use it as a limit on
the number of characters to be fetched. */
if (TYPE_NFIELDS (type) == 1
&& TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_RANGE)
{
LONGEST low_bound, high_bound;
get_discrete_bounds (TYPE_FIELD_TYPE (type, 0),
&low_bound, &high_bound);
fetchlimit = high_bound - low_bound + 1;
}
else
fetchlimit = UINT_MAX;
}
else if (TYPE_CODE (type) == TYPE_CODE_PTR)
fetchlimit = UINT_MAX;
else
/* We work only with arrays and pointers. */
goto error;
if (! c_textual_element_type (element_type, 0))
goto error;
classify_type (element_type, get_type_arch (element_type), charset);
width = TYPE_LENGTH (element_type);
/* If the string lives in GDB's memory instead of the inferior's,
then we just need to copy it to BUFFER. Also, since such strings
are arrays with known size, FETCHLIMIT will hold the size of the
array. */
if ((VALUE_LVAL (value) == not_lval
|| VALUE_LVAL (value) == lval_internalvar)
&& fetchlimit != UINT_MAX)
{
int i;
const gdb_byte *contents = value_contents (value);
/* If a length is specified, use that. */
if (*length >= 0)
i = *length;
else
/* Otherwise, look for a null character. */
for (i = 0; i < fetchlimit; i++)
if (extract_unsigned_integer (contents + i * width,
width, byte_order) == 0)
break;
/* I is now either a user-defined length, the number of non-null
characters, or FETCHLIMIT. */
*length = i * width;
*buffer = (gdb_byte *) xmalloc (*length);
memcpy (*buffer, contents, *length);
err = 0;
}
else
{
CORE_ADDR addr = value_as_address (value);
/* Prior to the fix for PR 16196 read_string would ignore fetchlimit
if length > 0. The old "broken" behaviour is the behaviour we want:
The caller may want to fetch 100 bytes from a variable length array
implemented using the common idiom of having an array of length 1 at
the end of a struct. In this case we want to ignore the declared
size of the array. However, it's counterintuitive to implement that
behaviour in read_string: what does fetchlimit otherwise mean if
length > 0. Therefore we implement the behaviour we want here:
If *length > 0, don't specify a fetchlimit. This preserves the
previous behaviour. We could move this check above where we know
whether the array is declared with a fixed size, but we only want
to apply this behaviour when calling read_string. PR 16286. */
if (*length > 0)
fetchlimit = UINT_MAX;
err = read_string (addr, *length, width, fetchlimit,
byte_order, buffer, length);
if (err != 0)
{
xfree (*buffer);
memory_error (TARGET_XFER_E_IO, addr);
}
}
/* If the LENGTH is specified at -1, we want to return the string
length up to the terminating null character. If an actual length
was specified, we want to return the length of exactly what was
read. */
if (req_length == -1)
/* If the last character is null, subtract it from LENGTH. */
if (*length > 0
&& extract_unsigned_integer (*buffer + *length - width,
width, byte_order) == 0)
*length -= width;
/* The read_string function will return the number of bytes read.
If length returned from read_string was > 0, return the number of
characters read by dividing the number of bytes by width. */
if (*length != 0)
*length = *length / width;
*char_type = element_type;
return;
error:
{
std::string type_str = type_to_string (type);
if (!type_str.empty ())
{
error (_("Trying to read string with inappropriate type `%s'."),
type_str.c_str ());
}
else
error (_("Trying to read string with inappropriate type."));
}
}
/* Evaluating C and C++ expressions. */
/* Convert a UCN. The digits of the UCN start at P and extend no
farther than LIMIT. DEST_CHARSET is the name of the character set
into which the UCN should be converted. The results are written to
OUTPUT. LENGTH is the maximum length of the UCN, either 4 or 8.
Returns a pointer to just after the final digit of the UCN. */
static char *
convert_ucn (char *p, char *limit, const char *dest_charset,
struct obstack *output, int length)
{
unsigned long result = 0;
gdb_byte data[4];
int i;
for (i = 0; i < length && p < limit && isxdigit (*p); ++i, ++p)
result = (result << 4) + host_hex_value (*p);
for (i = 3; i >= 0; --i)
{
data[i] = result & 0xff;
result >>= 8;
}
convert_between_encodings ("UTF-32BE", dest_charset, data,
4, 4, output, translit_none);
return p;
}
/* Emit a character, VALUE, which was specified numerically, to
OUTPUT. TYPE is the target character type. */
static void
emit_numeric_character (struct type *type, unsigned long value,
struct obstack *output)
{
gdb_byte *buffer;
buffer = (gdb_byte *) alloca (TYPE_LENGTH (type));
pack_long (buffer, type, value);
obstack_grow (output, buffer, TYPE_LENGTH (type));
}
/* Convert an octal escape sequence. TYPE is the target character
type. The digits of the escape sequence begin at P and extend no
farther than LIMIT. The result is written to OUTPUT. Returns a
pointer to just after the final digit of the escape sequence. */
static char *
convert_octal (struct type *type, char *p,
char *limit, struct obstack *output)
{
int i;
unsigned long value = 0;
for (i = 0;
i < 3 && p < limit && isdigit (*p) && *p != '8' && *p != '9';
++i)
{
value = 8 * value + host_hex_value (*p);
++p;
}
emit_numeric_character (type, value, output);
return p;
}
/* Convert a hex escape sequence. TYPE is the target character type.
The digits of the escape sequence begin at P and extend no farther
than LIMIT. The result is written to OUTPUT. Returns a pointer to
just after the final digit of the escape sequence. */
static char *
convert_hex (struct type *type, char *p,
char *limit, struct obstack *output)
{
unsigned long value = 0;
while (p < limit && isxdigit (*p))
{
value = 16 * value + host_hex_value (*p);
++p;
}
emit_numeric_character (type, value, output);
return p;
}
#define ADVANCE \
do { \
++p; \
if (p == limit) \
error (_("Malformed escape sequence")); \
} while (0)
/* Convert an escape sequence to a target format. TYPE is the target
character type to use, and DEST_CHARSET is the name of the target
character set. The backslash of the escape sequence is at *P, and
the escape sequence will not extend past LIMIT. The results are
written to OUTPUT. Returns a pointer to just past the final
character of the escape sequence. */
static char *
convert_escape (struct type *type, const char *dest_charset,
char *p, char *limit, struct obstack *output)
{
/* Skip the backslash. */
ADVANCE;
switch (*p)
{
case '\\':
obstack_1grow (output, '\\');
++p;
break;
case 'x':
ADVANCE;
if (!isxdigit (*p))
error (_("\\x used with no following hex digits."));
p = convert_hex (type, p, limit, output);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
p = convert_octal (type, p, limit, output);
break;
case 'u':
case 'U':
{
int length = *p == 'u' ? 4 : 8;
ADVANCE;
if (!isxdigit (*p))
error (_("\\u used with no following hex digits"));
p = convert_ucn (p, limit, dest_charset, output, length);
}
}
return p;
}
/* Given a single string from a (C-specific) OP_STRING list, convert
it to a target string, handling escape sequences specially. The
output is written to OUTPUT. DATA is the input string, which has
length LEN. DEST_CHARSET is the name of the target character set,
and TYPE is the type of target character to use. */
static void
parse_one_string (struct obstack *output, char *data, int len,
const char *dest_charset, struct type *type)
{
char *limit;
limit = data + len;
while (data < limit)
{
char *p = data;
/* Look for next escape, or the end of the input. */
while (p < limit && *p != '\\')
++p;
/* If we saw a run of characters, convert them all. */
if (p > data)
convert_between_encodings (host_charset (), dest_charset,
(gdb_byte *) data, p - data, 1,
output, translit_none);
/* If we saw an escape, convert it. */
if (p < limit)
p = convert_escape (type, dest_charset, p, limit, output);
data = p;
}
}
/* Expression evaluator for the C language family. Most operations
are delegated to evaluate_subexp_standard; see that function for a
description of the arguments. */
struct value *
evaluate_subexp_c (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
{
enum exp_opcode op = exp->elts[*pos].opcode;
switch (op)
{
case OP_STRING:
{
int oplen, limit;
struct type *type;
struct obstack output;
struct cleanup *cleanup;
struct value *result;
c_string_type dest_type;
const char *dest_charset;
int satisfy_expected = 0;
obstack_init (&output);
cleanup = make_cleanup_obstack_free (&output);
++*pos;
oplen = longest_to_int (exp->elts[*pos].longconst);
++*pos;
limit = *pos + BYTES_TO_EXP_ELEM (oplen + 1);
dest_type = ((enum c_string_type_values)
longest_to_int (exp->elts[*pos].longconst));
switch (dest_type & ~C_CHAR)
{
case C_STRING:
type = language_string_char_type (exp->language_defn,
exp->gdbarch);
break;
case C_WIDE_STRING:
type = lookup_typename (exp->language_defn, exp->gdbarch,
"wchar_t", NULL, 0);
break;
case C_STRING_16:
type = lookup_typename (exp->language_defn, exp->gdbarch,
"char16_t", NULL, 0);
break;
case C_STRING_32:
type = lookup_typename (exp->language_defn, exp->gdbarch,
"char32_t", NULL, 0);
break;
default:
internal_error (__FILE__, __LINE__, _("unhandled c_string_type"));
}
/* Ensure TYPE_LENGTH is valid for TYPE. */
check_typedef (type);
/* If the caller expects an array of some integral type,
satisfy them. If something odder is expected, rely on the
caller to cast. */
if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_ARRAY)
{
struct type *element_type
= check_typedef (TYPE_TARGET_TYPE (expect_type));
if (TYPE_CODE (element_type) == TYPE_CODE_INT
|| TYPE_CODE (element_type) == TYPE_CODE_CHAR)
{
type = element_type;
satisfy_expected = 1;
}
}
dest_charset = charset_for_string_type (dest_type, exp->gdbarch);
++*pos;
while (*pos < limit)
{
int len;
len = longest_to_int (exp->elts[*pos].longconst);
++*pos;
if (noside != EVAL_SKIP)
parse_one_string (&output, &exp->elts[*pos].string, len,
dest_charset, type);
*pos += BYTES_TO_EXP_ELEM (len);
}
/* Skip the trailing length and opcode. */
*pos += 2;
if (noside == EVAL_SKIP)
{
/* Return a dummy value of the appropriate type. */
if (expect_type != NULL)
result = allocate_value (expect_type);
else if ((dest_type & C_CHAR) != 0)
result = allocate_value (type);
else
result = value_cstring ("", 0, type);
do_cleanups (cleanup);
return result;
}
if ((dest_type & C_CHAR) != 0)
{
LONGEST value;
if (obstack_object_size (&output) != TYPE_LENGTH (type))
error (_("Could not convert character "
"constant to target character set"));
value = unpack_long (type, (gdb_byte *) obstack_base (&output));
result = value_from_longest (type, value);
}
else
{
int i;
/* Write the terminating character. */
for (i = 0; i < TYPE_LENGTH (type); ++i)
obstack_1grow (&output, 0);
if (satisfy_expected)
{
LONGEST low_bound, high_bound;
int element_size = TYPE_LENGTH (type);
if (get_discrete_bounds (TYPE_INDEX_TYPE (expect_type),
&low_bound, &high_bound) < 0)
{
low_bound = 0;
high_bound = (TYPE_LENGTH (expect_type) / element_size) - 1;
}
if (obstack_object_size (&output) / element_size
> (high_bound - low_bound + 1))
error (_("Too many array elements"));
result = allocate_value (expect_type);
memcpy (value_contents_raw (result), obstack_base (&output),
obstack_object_size (&output));
}
else
result = value_cstring ((const char *) obstack_base (&output),
obstack_object_size (&output),
type);
}
do_cleanups (cleanup);
return result;
}
break;
default:
break;
}
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
/* Table mapping opcodes into strings for printing operators
and precedences of the operators. */
const struct op_print c_op_print_tab[] =
{
{",", BINOP_COMMA, PREC_COMMA, 0},
{"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
{"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
{"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
{"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
{"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
{"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
{"==", BINOP_EQUAL, PREC_EQUAL, 0},
{"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
{"<=", BINOP_LEQ, PREC_ORDER, 0},
{">=", BINOP_GEQ, PREC_ORDER, 0},
{">", BINOP_GTR, PREC_ORDER, 0},
{"<", BINOP_LESS, PREC_ORDER, 0},
{">>", BINOP_RSH, PREC_SHIFT, 0},
{"<<", BINOP_LSH, PREC_SHIFT, 0},
{"+", BINOP_ADD, PREC_ADD, 0},
{"-", BINOP_SUB, PREC_ADD, 0},
{"*", BINOP_MUL, PREC_MUL, 0},
{"/", BINOP_DIV, PREC_MUL, 0},
{"%", BINOP_REM, PREC_MUL, 0},
{"@", BINOP_REPEAT, PREC_REPEAT, 0},
{"+", UNOP_PLUS, PREC_PREFIX, 0},
{"-", UNOP_NEG, PREC_PREFIX, 0},
{"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
{"~", UNOP_COMPLEMENT, PREC_PREFIX, 0},
{"*", UNOP_IND, PREC_PREFIX, 0},
{"&", UNOP_ADDR, PREC_PREFIX, 0},
{"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
{"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
{"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
{NULL, OP_NULL, PREC_PREFIX, 0}
};
enum c_primitive_types {
c_primitive_type_int,
c_primitive_type_long,
c_primitive_type_short,
c_primitive_type_char,
c_primitive_type_float,
c_primitive_type_double,
c_primitive_type_void,
c_primitive_type_long_long,
c_primitive_type_signed_char,
c_primitive_type_unsigned_char,
c_primitive_type_unsigned_short,
c_primitive_type_unsigned_int,
c_primitive_type_unsigned_long,
c_primitive_type_unsigned_long_long,
c_primitive_type_long_double,
c_primitive_type_complex,
c_primitive_type_double_complex,
c_primitive_type_decfloat,
c_primitive_type_decdouble,
c_primitive_type_declong,
nr_c_primitive_types
};
void
c_language_arch_info (struct gdbarch *gdbarch,
struct language_arch_info *lai)
{
const struct builtin_type *builtin = builtin_type (gdbarch);
lai->string_char_type = builtin->builtin_char;
lai->primitive_type_vector
= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_c_primitive_types + 1,
struct type *);
lai->primitive_type_vector [c_primitive_type_int] = builtin->builtin_int;
lai->primitive_type_vector [c_primitive_type_long] = builtin->builtin_long;
lai->primitive_type_vector [c_primitive_type_short] = builtin->builtin_short;
lai->primitive_type_vector [c_primitive_type_char] = builtin->builtin_char;
lai->primitive_type_vector [c_primitive_type_float] = builtin->builtin_float;
lai->primitive_type_vector [c_primitive_type_double] = builtin->builtin_double;
lai->primitive_type_vector [c_primitive_type_void] = builtin->builtin_void;
lai->primitive_type_vector [c_primitive_type_long_long] = builtin->builtin_long_long;
lai->primitive_type_vector [c_primitive_type_signed_char] = builtin->builtin_signed_char;
lai->primitive_type_vector [c_primitive_type_unsigned_char] = builtin->builtin_unsigned_char;
lai->primitive_type_vector [c_primitive_type_unsigned_short] = builtin->builtin_unsigned_short;
lai->primitive_type_vector [c_primitive_type_unsigned_int] = builtin->builtin_unsigned_int;
lai->primitive_type_vector [c_primitive_type_unsigned_long] = builtin->builtin_unsigned_long;
lai->primitive_type_vector [c_primitive_type_unsigned_long_long] = builtin->builtin_unsigned_long_long;
lai->primitive_type_vector [c_primitive_type_long_double] = builtin->builtin_long_double;
lai->primitive_type_vector [c_primitive_type_complex] = builtin->builtin_complex;
lai->primitive_type_vector [c_primitive_type_double_complex] = builtin->builtin_double_complex;
lai->primitive_type_vector [c_primitive_type_decfloat] = builtin->builtin_decfloat;
lai->primitive_type_vector [c_primitive_type_decdouble] = builtin->builtin_decdouble;
lai->primitive_type_vector [c_primitive_type_declong] = builtin->builtin_declong;
lai->bool_type_default = builtin->builtin_int;
}
const struct exp_descriptor exp_descriptor_c =
{
print_subexp_standard,
operator_length_standard,
operator_check_standard,
op_name_standard,
dump_subexp_body_standard,
evaluate_subexp_c
};
static const char *c_extensions[] =
{
".c", NULL
};
const struct language_defn c_language_defn =
{
"c", /* Language name */
"C",
language_c,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_c,
c_extensions,
&exp_descriptor_c,
c_parse,
c_yyerror,
null_post_parser,
c_printchar, /* Print a character constant */
c_printstr, /* Function to print string constant */
c_emit_char, /* Print a single char */
c_print_type, /* Print a type using appropriate syntax */
c_print_typedef, /* Print a typedef using appropriate syntax */
c_val_print, /* Print a value using appropriate syntax */
c_value_print, /* Print a top-level value */
default_read_var_value, /* la_read_var_value */
NULL, /* Language specific skip_trampoline */
NULL, /* name_of_this */
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
basic_lookup_transparent_type,/* lookup_transparent_type */
NULL, /* Language specific symbol demangler */
NULL,
NULL, /* Language specific
class_name_from_physname */
c_op_print_tab, /* expression operators for printing */
1, /* c-style arrays */
0, /* String lower bound */
default_word_break_characters,
default_make_symbol_completion_list,
c_language_arch_info,
default_print_array_index,
default_pass_by_reference,
c_get_string,
NULL, /* la_get_symbol_name_cmp */
iterate_over_symbols,
&c_varobj_ops,
c_get_compile_context,
c_compute_program,
LANG_MAGIC
};
enum cplus_primitive_types {
cplus_primitive_type_int,
cplus_primitive_type_long,
cplus_primitive_type_short,
cplus_primitive_type_char,
cplus_primitive_type_float,
cplus_primitive_type_double,
cplus_primitive_type_void,
cplus_primitive_type_long_long,
cplus_primitive_type_signed_char,
cplus_primitive_type_unsigned_char,
cplus_primitive_type_unsigned_short,
cplus_primitive_type_unsigned_int,
cplus_primitive_type_unsigned_long,
cplus_primitive_type_unsigned_long_long,
cplus_primitive_type_long_double,
cplus_primitive_type_complex,
cplus_primitive_type_double_complex,
cplus_primitive_type_bool,
cplus_primitive_type_decfloat,
cplus_primitive_type_decdouble,
cplus_primitive_type_declong,
nr_cplus_primitive_types
};
static void
cplus_language_arch_info (struct gdbarch *gdbarch,
struct language_arch_info *lai)
{
const struct builtin_type *builtin = builtin_type (gdbarch);
lai->string_char_type = builtin->builtin_char;
lai->primitive_type_vector
= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_cplus_primitive_types + 1,
struct type *);
lai->primitive_type_vector [cplus_primitive_type_int]
= builtin->builtin_int;
lai->primitive_type_vector [cplus_primitive_type_long]
= builtin->builtin_long;
lai->primitive_type_vector [cplus_primitive_type_short]
= builtin->builtin_short;
lai->primitive_type_vector [cplus_primitive_type_char]
= builtin->builtin_char;
lai->primitive_type_vector [cplus_primitive_type_float]
= builtin->builtin_float;
lai->primitive_type_vector [cplus_primitive_type_double]
= builtin->builtin_double;
lai->primitive_type_vector [cplus_primitive_type_void]
= builtin->builtin_void;
lai->primitive_type_vector [cplus_primitive_type_long_long]
= builtin->builtin_long_long;
lai->primitive_type_vector [cplus_primitive_type_signed_char]
= builtin->builtin_signed_char;
lai->primitive_type_vector [cplus_primitive_type_unsigned_char]
= builtin->builtin_unsigned_char;
lai->primitive_type_vector [cplus_primitive_type_unsigned_short]
= builtin->builtin_unsigned_short;
lai->primitive_type_vector [cplus_primitive_type_unsigned_int]
= builtin->builtin_unsigned_int;
lai->primitive_type_vector [cplus_primitive_type_unsigned_long]
= builtin->builtin_unsigned_long;
lai->primitive_type_vector [cplus_primitive_type_unsigned_long_long]
= builtin->builtin_unsigned_long_long;
lai->primitive_type_vector [cplus_primitive_type_long_double]
= builtin->builtin_long_double;
lai->primitive_type_vector [cplus_primitive_type_complex]
= builtin->builtin_complex;
lai->primitive_type_vector [cplus_primitive_type_double_complex]
= builtin->builtin_double_complex;
lai->primitive_type_vector [cplus_primitive_type_bool]
= builtin->builtin_bool;
lai->primitive_type_vector [cplus_primitive_type_decfloat]
= builtin->builtin_decfloat;
lai->primitive_type_vector [cplus_primitive_type_decdouble]
= builtin->builtin_decdouble;
lai->primitive_type_vector [cplus_primitive_type_declong]
= builtin->builtin_declong;
lai->bool_type_symbol = "bool";
lai->bool_type_default = builtin->builtin_bool;
}
static const char *cplus_extensions[] =
{
".C", ".cc", ".cp", ".cpp", ".cxx", ".c++", NULL
};
const struct language_defn cplus_language_defn =
{
"c++", /* Language name */
"C++",
language_cplus,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_c,
cplus_extensions,
&exp_descriptor_c,
c_parse,
c_yyerror,
null_post_parser,
c_printchar, /* Print a character constant */
c_printstr, /* Function to print string constant */
c_emit_char, /* Print a single char */
c_print_type, /* Print a type using appropriate syntax */
c_print_typedef, /* Print a typedef using appropriate syntax */
c_val_print, /* Print a value using appropriate syntax */
c_value_print, /* Print a top-level value */
default_read_var_value, /* la_read_var_value */
cplus_skip_trampoline, /* Language specific skip_trampoline */
"this", /* name_of_this */
cp_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
cp_lookup_transparent_type, /* lookup_transparent_type */
gdb_demangle, /* Language specific symbol demangler */
gdb_sniff_from_mangled_name,
cp_class_name_from_physname, /* Language specific
class_name_from_physname */
c_op_print_tab, /* expression operators for printing */
1, /* c-style arrays */
0, /* String lower bound */
default_word_break_characters,
default_make_symbol_completion_list,
cplus_language_arch_info,
default_print_array_index,
cp_pass_by_reference,
c_get_string,
NULL, /* la_get_symbol_name_cmp */
iterate_over_symbols,
&cplus_varobj_ops,
NULL,
NULL,
LANG_MAGIC
};
static const char *asm_extensions[] =
{
".s", ".sx", ".S", NULL
};
const struct language_defn asm_language_defn =
{
"asm", /* Language name */
"assembly",
language_asm,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_c,
asm_extensions,
&exp_descriptor_c,
c_parse,
c_yyerror,
null_post_parser,
c_printchar, /* Print a character constant */
c_printstr, /* Function to print string constant */
c_emit_char, /* Print a single char */
c_print_type, /* Print a type using appropriate syntax */
c_print_typedef, /* Print a typedef using appropriate syntax */
c_val_print, /* Print a value using appropriate syntax */
c_value_print, /* Print a top-level value */
default_read_var_value, /* la_read_var_value */
NULL, /* Language specific skip_trampoline */
NULL, /* name_of_this */
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
basic_lookup_transparent_type,/* lookup_transparent_type */
NULL, /* Language specific symbol demangler */
NULL,
NULL, /* Language specific
class_name_from_physname */
c_op_print_tab, /* expression operators for printing */
1, /* c-style arrays */
0, /* String lower bound */
default_word_break_characters,
default_make_symbol_completion_list,
c_language_arch_info, /* FIXME: la_language_arch_info. */
default_print_array_index,
default_pass_by_reference,
c_get_string,
NULL, /* la_get_symbol_name_cmp */
iterate_over_symbols,
&default_varobj_ops,
NULL,
NULL,
LANG_MAGIC
};
/* The following language_defn does not represent a real language.
It just provides a minimal support a-la-C that should allow users
to do some simple operations when debugging applications that use
a language currently not supported by GDB. */
const struct language_defn minimal_language_defn =
{
"minimal", /* Language name */
"Minimal",
language_minimal,
range_check_off,
case_sensitive_on,
array_row_major,
macro_expansion_c,
NULL,
&exp_descriptor_c,
c_parse,
c_yyerror,
null_post_parser,
c_printchar, /* Print a character constant */
c_printstr, /* Function to print string constant */
c_emit_char, /* Print a single char */
c_print_type, /* Print a type using appropriate syntax */
c_print_typedef, /* Print a typedef using appropriate syntax */
c_val_print, /* Print a value using appropriate syntax */
c_value_print, /* Print a top-level value */
default_read_var_value, /* la_read_var_value */
NULL, /* Language specific skip_trampoline */
NULL, /* name_of_this */
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
basic_lookup_transparent_type,/* lookup_transparent_type */
NULL, /* Language specific symbol demangler */
NULL,
NULL, /* Language specific
class_name_from_physname */
c_op_print_tab, /* expression operators for printing */
1, /* c-style arrays */
0, /* String lower bound */
default_word_break_characters,
default_make_symbol_completion_list,
c_language_arch_info,
default_print_array_index,
default_pass_by_reference,
c_get_string,
NULL, /* la_get_symbol_name_cmp */
iterate_over_symbols,
&default_varobj_ops,
NULL,
NULL,
LANG_MAGIC
};
void
_initialize_c_language (void)
{
add_language (&c_language_defn);
add_language (&cplus_language_defn);
add_language (&asm_language_defn);
add_language (&minimal_language_defn);
}
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