espressif/binutils-gdb
1
0
Fork 0
mirror of https://github.com/espressif/binutils-gdb.git synced 2025-07-28 04:13:28 +08:00
Code Issues Packages Projects Releases Wiki Activity

Add c-exp.h and c_string_operation

Browse Source 
This adds the new file c-exp.h, where C operation classes will be
declared.  The first such class, c_string_operation, is also added
here.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

	* c-lang.c (c_string_operation::evaluate): New method.
	* c-exp.h: New file.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent 9186293fd6
commit 72d0a71134
3 changed files with 177 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

126
gdb/c-lang.c
View File

@ -37,6 +37,7 @@
#include "gdbcore.h"
#include "gdbarch.h"
#include "compile/compile-internal.h"
#include "c-exp.h"
/* Given a C string type, STR_TYPE, return the corresponding target
character set name. */
@ -728,6 +729,131 @@ evaluate_subexp_c (struct type *expect_type, struct expression *exp,
}
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
namespace expr
{
value *
c_string_operation::evaluate (struct type *expect_type,
struct expression *exp,
enum noside noside)
{
struct type *type;
struct value *result;
c_string_type dest_type;
const char *dest_charset;
int satisfy_expected = 0;
auto_obstack output;
dest_type = std::get<0> (m_storage);
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, "wchar_t", NULL, 0);
break;
case C_STRING_16:
type = lookup_typename (exp->language_defn, "char16_t", NULL, 0);
break;
case C_STRING_32:
type = lookup_typename (exp->language_defn, "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 && expect_type->code () == TYPE_CODE_ARRAY)
{
struct type *element_type
= check_typedef (TYPE_TARGET_TYPE (expect_type));
if (element_type->code () == TYPE_CODE_INT
|| element_type->code () == TYPE_CODE_CHAR)
{
type = element_type;
satisfy_expected = 1;
}
}
dest_charset = charset_for_string_type (dest_type, exp->gdbarch);
if (noside != EVAL_SKIP)
{
for (const std::string &item : std::get<1> (m_storage))
parse_one_string (&output, item.c_str (), item.size (),
dest_charset, type);
}
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);
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 (expect_type->index_type (),
&low_bound, &high_bound))
{
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);
}
return result;
}
} /* namespace expr */
/* See c-lang.h. */