#include "demangle.h"
#include "cp-abi.h"
#include "cp-support.h"
+#include "gdb_obstack.h"
+#include <ctype.h>
extern void _initialize_c_language (void);
-static void c_emit_char (int c, struct ui_file * stream, int quoter);
-/* 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. */
+/* Given a C string type, STR_TYPE, return the corresponding target
+ character set name. */
-static void
-c_emit_char (int c, struct ui_file *stream, int quoter)
+static const char *
+charset_for_string_type (enum c_string_type str_type,
+ enum bfd_endian byte_order)
{
- const char *escape;
- int host_char;
+ switch (str_type & ~C_CHAR)
+ {
+ case C_STRING:
+ return target_charset ();
+ case C_WIDE_STRING:
+ return target_wide_charset (byte_order);
+ case C_STRING_16:
+ /* FIXME: UTF-16 is not always correct. */
+ if (byte_order == BFD_ENDIAN_BIG)
+ return "UTF-16BE";
+ else
+ return "UTF-16LE";
+ case C_STRING_32:
+ /* FIXME: UTF-32 is not always correct. */
+ if (byte_order == BFD_ENDIAN_BIG)
+ return "UTF-32BE";
+ else
+ return "UTF-32LE";
+ }
+ internal_error (__FILE__, __LINE__, "unhandled c_string_type");
+}
- c &= 0xFF; /* Avoid sign bit follies */
+/* 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 enum c_string_type
+classify_type (struct type *elttype, enum bfd_endian byte_order,
+ const char **encoding)
+{
+ struct type *saved_type;
+ enum c_string_type result;
- escape = c_target_char_has_backslash_escape (c);
- if (escape)
+ /* 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)
{
- if (quoter == '"' && strcmp (escape, "0") == 0)
- /* Print nulls embedded in double quoted strings as \000 to
- prevent ambiguity. */
- fprintf_filtered (stream, "\\000");
+ 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
- fprintf_filtered (stream, "\\%s", escape);
+ {
+ /* 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++. */
+ CHECK_TYPEDEF (elttype);
+ }
}
- else if (target_char_to_host (c, &host_char)
- && host_char_print_literally (host_char))
+
+ /* Punt. */
+ result = C_CHAR;
+
+ done:
+ if (encoding)
+ *encoding = charset_for_string_type (result, byte_order);
+
+ return result;
+}
+
+/* Return true if print_wchar can display W without resorting to a
+ numeric escape, false otherwise. */
+
+static int
+wchar_printable (gdb_wchar_t w)
+{
+ return (gdb_iswprint (w)
+ || w == LCST ('\a') || w == LCST ('\b')
+ || w == LCST ('\f') || w == LCST ('\n')
+ || w == LCST ('\r') || w == LCST ('\t')
+ || w == LCST ('\v'));
+}
+
+/* A helper function that converts the contents of STRING to wide
+ characters and then appends them to OUTPUT. */
+
+static void
+append_string_as_wide (const char *string, struct obstack *output)
+{
+ for (; *string; ++string)
+ {
+ gdb_wchar_t w = gdb_btowc (*string);
+ obstack_grow (output, &w, sizeof (gdb_wchar_t));
+ }
+}
+
+/* Print a wide character W to OUTPUT. ORIG is a pointer to the
+ original (target) bytes representing the character, ORIG_LEN is the
+ number of valid bytes. WIDTH is the number of bytes in a base
+ characters of the type. OUTPUT is an obstack to which wide
+ characters are emitted. QUOTER is a (narrow) character indicating
+ the style of quotes surrounding the character to be printed.
+ NEED_ESCAPE is an in/out flag which is used to track numeric
+ escapes across calls. */
+
+static void
+print_wchar (gdb_wint_t w, const gdb_byte *orig, int orig_len,
+ int width, enum bfd_endian byte_order, struct obstack *output,
+ int quoter, int *need_escapep)
+{
+ int need_escape = *need_escapep;
+ *need_escapep = 0;
+ if (gdb_iswprint (w) && (!need_escape || (!gdb_iswdigit (w)
+ && w != LCST ('8')
+ && w != LCST ('9'))))
{
- if (host_char == '\\' || host_char == quoter)
- fputs_filtered ("\\", stream);
- fprintf_filtered (stream, "%c", host_char);
+ gdb_wchar_t wchar = w;
+
+ if (w == gdb_btowc (quoter) || w == LCST ('\\'))
+ obstack_grow_wstr (output, LCST ("\\"));
+ obstack_grow (output, &wchar, sizeof (gdb_wchar_t));
}
else
- fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
+ {
+ switch (w)
+ {
+ case LCST ('\a'):
+ obstack_grow_wstr (output, LCST ("\\a"));
+ break;
+ case LCST ('\b'):
+ obstack_grow_wstr (output, LCST ("\\b"));
+ break;
+ case LCST ('\f'):
+ obstack_grow_wstr (output, LCST ("\\f"));
+ break;
+ case LCST ('\n'):
+ obstack_grow_wstr (output, LCST ("\\n"));
+ break;
+ case LCST ('\r'):
+ obstack_grow_wstr (output, LCST ("\\r"));
+ break;
+ case LCST ('\t'):
+ obstack_grow_wstr (output, LCST ("\\t"));
+ break;
+ case LCST ('\v'):
+ obstack_grow_wstr (output, LCST ("\\v"));
+ break;
+ default:
+ {
+ int i;
+
+ for (i = 0; i + width <= orig_len; i += width)
+ {
+ char octal[30];
+ ULONGEST value;
+ value = extract_unsigned_integer (&orig[i], width, byte_order);
+ /* If the value fits in 3 octal digits, print it that
+ way. Otherwise, print it as a hex escape. */
+ if (value <= 0777)
+ sprintf (octal, "\\%.3o", (int) (value & 0777));
+ else
+ sprintf (octal, "\\x%lx", (long) value);
+ append_string_as_wide (octal, output);
+ }
+ /* If we somehow have extra bytes, print them now. */
+ while (i < orig_len)
+ {
+ char octal[5];
+ sprintf (octal, "\\%.3o", orig[i] & 0xff);
+ append_string_as_wide (octal, output);
+ ++i;
+ }
+
+ *need_escapep = 1;
+ }
+ break;
+ }
+ }
+}
+
+/* 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. */
+
+static void
+c_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
+ struct obstack wchar_buf, output;
+ struct cleanup *cleanups;
+ const char *encoding;
+ gdb_byte *buf;
+ struct wchar_iterator *iter;
+ int need_escape = 0;
+
+ classify_type (type, byte_order, &encoding);
+
+ buf = alloca (TYPE_LENGTH (type));
+ pack_long (buf, type, c);
+
+ iter = make_wchar_iterator (buf, TYPE_LENGTH (type), encoding,
+ TYPE_LENGTH (type));
+ cleanups = make_cleanup_wchar_iterator (iter);
+
+ /* This holds the printable form of the wchar_t data. */
+ obstack_init (&wchar_buf);
+ make_cleanup_obstack_free (&wchar_buf);
+
+ while (1)
+ {
+ int num_chars;
+ gdb_wchar_t *chars;
+ const gdb_byte *buf;
+ size_t buflen;
+ int print_escape = 1;
+ enum wchar_iterate_result result;
+
+ num_chars = wchar_iterate (iter, &result, &chars, &buf, &buflen);
+ if (num_chars < 0)
+ break;
+ if (num_chars > 0)
+ {
+ /* If all characters are printable, print them. Otherwise,
+ we're going to have to print an escape sequence. We
+ check all characters because we want to print the target
+ bytes in the escape sequence, and we don't know character
+ boundaries there. */
+ int i;
+
+ print_escape = 0;
+ for (i = 0; i < num_chars; ++i)
+ if (!wchar_printable (chars[i]))
+ {
+ print_escape = 1;
+ break;
+ }
+
+ if (!print_escape)
+ {
+ for (i = 0; i < num_chars; ++i)
+ print_wchar (chars[i], buf, buflen, TYPE_LENGTH (type),
+ byte_order, &wchar_buf, quoter, &need_escape);
+ }
+ }
+
+ /* This handles the NUM_CHARS == 0 case as well. */
+ if (print_escape)
+ print_wchar (gdb_WEOF, buf, buflen, TYPE_LENGTH (type), byte_order,
+ &wchar_buf, quoter, &need_escape);
+ }
+
+ /* The output in the host encoding. */
+ obstack_init (&output);
+ make_cleanup_obstack_free (&output);
+
+ convert_between_encodings (INTERMEDIATE_ENCODING, host_charset (),
+ obstack_base (&wchar_buf),
+ obstack_object_size (&wchar_buf),
+ 1, &output, translit_char);
+ obstack_1grow (&output, '\0');
+
+ fputs_filtered (obstack_base (&output), stream);
+
+ do_cleanups (cleanups);
}
void
-c_printchar (int c, struct ui_file *stream)
+c_printchar (int c, struct type *type, struct ui_file *stream)
{
+ enum c_string_type str_type;
+
+ str_type = classify_type (type, BFD_ENDIAN_UNKNOWN, 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, stream, '\'');
+ LA_EMIT_CHAR (c, type, stream, '\'');
fputc_filtered ('\'', stream);
}
printing LENGTH characters, or if FORCE_ELLIPSES. */
void
-c_printstr (struct ui_file *stream, const gdb_byte *string,
- unsigned int length, int width, int force_ellipses,
+c_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
+ unsigned int length, int force_ellipses,
const struct value_print_options *options)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
unsigned int i;
unsigned int things_printed = 0;
int in_quotes = 0;
int need_comma = 0;
+ int width = TYPE_LENGTH (type);
+ struct obstack wchar_buf, output;
+ struct cleanup *cleanup;
+ enum c_string_type str_type;
+ const char *encoding;
+ struct wchar_iterator *iter;
+ int finished = 0;
+ int need_escape = 0;
/* If the string was not truncated due to `set print elements', and
the last byte of it is a null, we don't print that, in traditional C
style. */
if (!force_ellipses
&& length > 0
- && (extract_unsigned_integer (string + (length - 1) * width, width)
- == '\0'))
+ && (extract_unsigned_integer (string + (length - 1) * width,
+ width, byte_order) == 0))
length--;
+ str_type = classify_type (type, byte_order, &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;
+ }
+
if (length == 0)
{
fputs_filtered ("\"\"", stream);
return;
}
- for (i = 0; i < length && things_printed < options->print_max; ++i)
+ if (length == -1)
+ {
+ unsigned long current_char = 1;
+ for (i = 0; current_char; ++i)
+ {
+ QUIT;
+ current_char = extract_unsigned_integer (string + i * width,
+ width, byte_order);
+ }
+ length = i;
+ }
+
+ /* Arrange to iterate over the characters, in wchar_t form. */
+ iter = make_wchar_iterator (string, length * width, encoding, width);
+ cleanup = make_cleanup_wchar_iterator (iter);
+
+ /* WCHAR_BUF is the obstack we use to represent the string in
+ wchar_t form. */
+ obstack_init (&wchar_buf);
+ make_cleanup_obstack_free (&wchar_buf);
+
+ while (!finished && things_printed < options->print_max)
{
- /* Position of the character we are examining
- to see whether it is repeated. */
- unsigned int rep1;
- /* Number of repetitions we have detected so far. */
- unsigned int reps;
- unsigned long current_char;
+ int num_chars;
+ enum wchar_iterate_result result;
+ gdb_wchar_t *chars;
+ const gdb_byte *buf;
+ size_t buflen;
QUIT;
if (need_comma)
{
- fputs_filtered (", ", stream);
+ obstack_grow_wstr (&wchar_buf, LCST (", "));
need_comma = 0;
}
- current_char = extract_unsigned_integer (string + i * width, width);
+ num_chars = wchar_iterate (iter, &result, &chars, &buf, &buflen);
+ /* We only look at repetitions when we were able to convert a
+ single character in isolation. This makes the code simpler
+ and probably does the sensible thing in the majority of
+ cases. */
+ while (num_chars == 1 && things_printed < options->print_max)
+ {
+ /* Count the number of repetitions. */
+ unsigned int reps = 0;
+ gdb_wchar_t current_char = chars[0];
+ const gdb_byte *orig_buf = buf;
+ int orig_len = buflen;
+
+ if (need_comma)
+ {
+ obstack_grow_wstr (&wchar_buf, LCST (", "));
+ need_comma = 0;
+ }
+
+ while (num_chars == 1 && current_char == chars[0])
+ {
+ num_chars = wchar_iterate (iter, &result, &chars, &buf, &buflen);
+ ++reps;
+ }
+
+ /* Emit CURRENT_CHAR according to the repetition count and
+ options. */
+ if (reps > options->repeat_count_threshold)
+ {
+ if (in_quotes)
+ {
+ if (options->inspect_it)
+ obstack_grow_wstr (&wchar_buf, LCST ("\\\", "));
+ else
+ obstack_grow_wstr (&wchar_buf, LCST ("\", "));
+ in_quotes = 0;
+ }
+ obstack_grow_wstr (&wchar_buf, LCST ("'"));
+ need_escape = 0;
+ print_wchar (current_char, orig_buf, orig_len, width,
+ byte_order, &wchar_buf, '\'', &need_escape);
+ obstack_grow_wstr (&wchar_buf, LCST ("'"));
+ {
+ /* Painful gyrations. */
+ int j;
+ char *s = xstrprintf (_(" <repeats %u times>"), reps);
+ for (j = 0; s[j]; ++j)
+ {
+ gdb_wchar_t w = gdb_btowc (s[j]);
+ obstack_grow (&wchar_buf, &w, sizeof (gdb_wchar_t));
+ }
+ xfree (s);
+ }
+ things_printed += options->repeat_count_threshold;
+ need_comma = 1;
+ }
+ else
+ {
+ /* Saw the character one or more times, but fewer than
+ the repetition threshold. */
+ if (!in_quotes)
+ {
+ if (options->inspect_it)
+ obstack_grow_wstr (&wchar_buf, LCST ("\\\""));
+ else
+ obstack_grow_wstr (&wchar_buf, LCST ("\""));
+ in_quotes = 1;
+ need_escape = 0;
+ }
+
+ while (reps-- > 0)
+ {
+ print_wchar (current_char, orig_buf, orig_len, width,
+ byte_order, &wchar_buf, '"', &need_escape);
+ ++things_printed;
+ }
+ }
+ }
- rep1 = i + 1;
- reps = 1;
- while (rep1 < length
- && extract_unsigned_integer (string + rep1 * width, width)
- == current_char)
+ /* NUM_CHARS and the other outputs from wchar_iterate are valid
+ here regardless of which branch was taken above. */
+ if (num_chars < 0)
{
- ++rep1;
- ++reps;
+ /* Hit EOF. */
+ finished = 1;
+ break;
}
- if (reps > options->repeat_count_threshold)
+ switch (result)
{
- if (in_quotes)
+ case wchar_iterate_invalid:
+ if (!in_quotes)
{
if (options->inspect_it)
- fputs_filtered ("\\\", ", stream);
+ obstack_grow_wstr (&wchar_buf, LCST ("\\\""));
else
- fputs_filtered ("\", ", stream);
- in_quotes = 0;
+ obstack_grow_wstr (&wchar_buf, LCST ("\""));
+ in_quotes = 1;
}
- LA_PRINT_CHAR (current_char, stream);
- fprintf_filtered (stream, _(" <repeats %u times>"), reps);
- i = rep1 - 1;
- things_printed += options->repeat_count_threshold;
- need_comma = 1;
- }
- else
- {
- if (!in_quotes)
+ need_escape = 0;
+ print_wchar (gdb_WEOF, buf, buflen, width, byte_order, &wchar_buf,
+ '"', &need_escape);
+ break;
+
+ case wchar_iterate_incomplete:
+ if (in_quotes)
{
if (options->inspect_it)
- fputs_filtered ("\\\"", stream);
+ obstack_grow_wstr (&wchar_buf, LCST ("\\\","));
else
- fputs_filtered ("\"", stream);
- in_quotes = 1;
+ obstack_grow_wstr (&wchar_buf, LCST ("\","));
+ in_quotes = 0;
}
- LA_EMIT_CHAR (current_char, stream, '"');
- ++things_printed;
+ obstack_grow_wstr (&wchar_buf, LCST (" <incomplete sequence "));
+ print_wchar (gdb_WEOF, buf, buflen, width, byte_order, &wchar_buf,
+ 0, &need_escape);
+ obstack_grow_wstr (&wchar_buf, LCST (">"));
+ finished = 1;
+ break;
}
}
if (in_quotes)
{
if (options->inspect_it)
- fputs_filtered ("\\\"", stream);
+ obstack_grow_wstr (&wchar_buf, LCST ("\\\""));
else
- fputs_filtered ("\"", stream);
+ obstack_grow_wstr (&wchar_buf, LCST ("\""));
}
- if (force_ellipses || i < length)
- fputs_filtered ("...", stream);
-}
+ if (force_ellipses || !finished)
+ obstack_grow_wstr (&wchar_buf, LCST ("..."));
-/* Obtain a C string from the inferior storing it in a newly allocated
- buffer in BUFFER, which should be freed by the caller. The string is
- read until a null character is found. If VALUE is an array with known
- length, the function will not read past the end of the array. LENGTH
- will contain the size of the string in bytes (not counting the null
- character).
+ /* OUTPUT is where we collect `char's for printing. */
+ obstack_init (&output);
+ make_cleanup_obstack_free (&output);
+
+ convert_between_encodings (INTERMEDIATE_ENCODING, host_charset (),
+ obstack_base (&wchar_buf),
+ obstack_object_size (&wchar_buf),
+ 1, &output, translit_char);
+ obstack_1grow (&output, '\0');
- Assumes strings are terminated by a null character. The size of a character
- is determined by the length of the target type of the pointer or array.
- This means that a null byte present in a multi-byte character will not
- terminate the string unless the whole character is null.
+ fputs_filtered (obstack_base (&output), stream);
- CHARSET is always set to the target charset. */
+ do_cleanups (cleanup);
+}
+
+/* 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, the function will not read past the end of the array.
+ 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,
- const char **charset)
+ 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));
+ enum c_string_type kind;
if (element_type == NULL)
goto error;
/* We work only with arrays and pointers. */
goto error;
- element_type = check_typedef (element_type);
- if (TYPE_CODE (element_type) != TYPE_CODE_INT
- && TYPE_CODE (element_type) != TYPE_CODE_CHAR)
- /* If the elements are not integers or characters, we don't consider it
- a string. */
+ if (! c_textual_element_type (element_type, 0))
goto error;
-
+ kind = classify_type (element_type,
+ gdbarch_byte_order (get_type_arch (element_type)),
+ charset);
width = TYPE_LENGTH (element_type);
- /* If the string lives in GDB's memory intead of the inferior's, then we
+ /* 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
int i;
const gdb_byte *contents = value_contents (value);
- /* Look for a null character. */
- for (i = 0; i < fetchlimit; i++)
- if (extract_unsigned_integer (contents + i * width, width) == 0)
- break;
-
- /* I is now either the number of non-null characters, or FETCHLIMIT. */
+ /* 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 = xmalloc (*length);
memcpy (*buffer, contents, *length);
}
else
{
- err = read_string (value_as_address (value), -1, width, fetchlimit,
- buffer, length);
+ err = read_string (value_as_address (value), *length, width, fetchlimit,
+ byte_order, buffer, length);
if (err)
{
- xfree (buffer);
+ xfree (*buffer);
error (_("Error reading string from inferior: %s"),
safe_strerror (err));
}
}
- /* If the last character is null, subtract it from LENGTH. */
- if (*length > 0
- && extract_unsigned_integer (*buffer + *length - width, width) == 0)
- *length -= width;
+ /* 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;
- *charset = target_charset ();
+ *char_type = element_type;
return;
}
\f
-/* Preprocessing and parsing C and C++ expressions. */
+/* 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 = 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,
+ 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. */
+
+static 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;
+ enum c_string_type dest_type;
+ const char *dest_charset;
+ enum bfd_endian byte_order;
+
+ 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) 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);
+
+ byte_order = gdbarch_byte_order (exp->gdbarch);
+ dest_charset = charset_for_string_type (dest_type, byte_order);
+
+ ++*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 ((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, 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);
+ result = value_cstring (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);
+}
\f
lai->bool_type_default = builtin->builtin_int;
}
+static const struct exp_descriptor exp_descriptor_c =
+{
+ print_subexp_standard,
+ operator_length_standard,
+ op_name_standard,
+ dump_subexp_body_standard,
+ evaluate_subexp_c
+};
+
const struct language_defn c_language_defn =
{
"c", /* Language name */
case_sensitive_on,
array_row_major,
macro_expansion_c,
- &exp_descriptor_standard,
+ &exp_descriptor_c,
c_parse,
c_error,
null_post_parser,
case_sensitive_on,
array_row_major,
macro_expansion_c,
- &exp_descriptor_standard,
+ &exp_descriptor_c,
c_parse,
c_error,
null_post_parser,
case_sensitive_on,
array_row_major,
macro_expansion_c,
- &exp_descriptor_standard,
+ &exp_descriptor_c,
c_parse,
c_error,
null_post_parser,
case_sensitive_on,
array_row_major,
macro_expansion_c,
- &exp_descriptor_standard,
+ &exp_descriptor_c,
c_parse,
c_error,
null_post_parser,
projects / deliverable / binutils-gdb.git / blobdiff