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jv-lang.c
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/* Java language support routines for GDB, the GNU debugger.
Copyright (C) 1997-2015 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 "symfile.h"
#include "objfiles.h"
#include "value.h"
#include "c-lang.h"
#include "jv-lang.h"
#include "varobj.h"
#include "gdbcore.h"
#include "block.h"
#include "demangle.h"
#include "dictionary.h"
#include <ctype.h>
#include "charset.h"
#include "valprint.h"
#include "cp-support.h"
/* Local functions */
extern void _initialize_java_language (void);
static int java_demangled_signature_length (const char *);
static void java_demangled_signature_copy (char *, const char *);
static struct compunit_symtab *get_java_class_symtab (struct gdbarch *gdbarch);
static char *get_java_utf8_name (struct obstack *obstack, struct value *name);
static int java_class_is_primitive (struct value *clas);
static struct value *java_value_string (char *ptr, int len);
static void java_emit_char (int c, struct type *type,
struct ui_file * stream, int quoter);
static char *java_class_name_from_physname (const char *physname);
static const struct objfile_data *jv_dynamics_objfile_data_key;
/* The dynamic objfile is kept per-program-space. This key lets us
associate the objfile with the program space. */
static const struct program_space_data *jv_dynamics_progspace_key;
static struct type *java_link_class_type (struct gdbarch *,
struct type *, struct value *);
/* An instance of this structure is used to store some data that must
be freed. */
struct jv_per_objfile_data
{
/* The expandable dictionary we use. */
struct dictionary *dict;
};
/* A function called when the dynamics_objfile is freed. We use this
to clean up some internal state. */
static void
jv_per_objfile_free (struct objfile *objfile, void *data)
{
struct jv_per_objfile_data *jv_data = data;
struct objfile *dynamics_objfile;
dynamics_objfile = program_space_data (current_program_space,
jv_dynamics_progspace_key);
gdb_assert (objfile == dynamics_objfile);
if (jv_data->dict)
dict_free (jv_data->dict);
xfree (jv_data);
set_program_space_data (current_program_space,
jv_dynamics_progspace_key,
NULL);
}
/* FIXME: carlton/2003-02-04: This is the main or only caller of
allocate_objfile with first argument NULL; as a result, this code
breaks every so often. Somebody should write a test case that
exercises GDB in various ways (e.g. something involving loading a
dynamic library) after this code has been called. */
static struct objfile *
get_dynamics_objfile (struct gdbarch *gdbarch)
{
struct objfile *dynamics_objfile;
dynamics_objfile = program_space_data (current_program_space,
jv_dynamics_progspace_key);
if (dynamics_objfile == NULL)
{
struct jv_per_objfile_data *data;
/* Mark it as shared so that it is cleared when the inferior is
re-run. */
dynamics_objfile = allocate_objfile (NULL, NULL,
OBJF_SHARED | OBJF_NOT_FILENAME);
dynamics_objfile->per_bfd->gdbarch = gdbarch;
data = XCNEW (struct jv_per_objfile_data);
set_objfile_data (dynamics_objfile, jv_dynamics_objfile_data_key, data);
set_program_space_data (current_program_space,
jv_dynamics_progspace_key,
dynamics_objfile);
}
return dynamics_objfile;
}
static struct compunit_symtab *
get_java_class_symtab (struct gdbarch *gdbarch)
{
struct objfile *objfile = get_dynamics_objfile (gdbarch);
struct compunit_symtab *class_symtab = objfile->compunit_symtabs;
if (class_symtab == NULL)
{
struct blockvector *bv;
struct block *bl;
struct jv_per_objfile_data *jv_data;
class_symtab = allocate_compunit_symtab (objfile, "<java-classes>");
add_compunit_symtab_to_objfile (class_symtab);
allocate_symtab (class_symtab, "<java-classes>");
COMPUNIT_FILETABS (class_symtab)->language = language_java;
bv = (struct blockvector *)
obstack_alloc (&objfile->objfile_obstack,
sizeof (struct blockvector) + sizeof (struct block *));
BLOCKVECTOR_NBLOCKS (bv) = 1;
COMPUNIT_BLOCKVECTOR (class_symtab) = bv;
/* Allocate dummy STATIC_BLOCK. */
bl = allocate_block (&objfile->objfile_obstack);
BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack,
NULL);
BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl;
/* Allocate GLOBAL_BLOCK. */
bl = allocate_global_block (&objfile->objfile_obstack);
BLOCK_DICT (bl) = dict_create_hashed_expandable ();
set_block_compunit_symtab (bl, class_symtab);
BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl;
/* Arrange to free the dict. */
jv_data = objfile_data (objfile, jv_dynamics_objfile_data_key);
jv_data->dict = BLOCK_DICT (bl);
}
return class_symtab;
}
static void
add_class_symtab_symbol (struct symbol *sym)
{
struct compunit_symtab *cust = get_java_class_symtab (symbol_arch (sym));
const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (cust);
dict_add_symbol (BLOCK_DICT (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)), sym);
}
static struct symbol *
add_class_symbol (struct type *type, CORE_ADDR addr)
{
struct symbol *sym;
struct objfile *objfile = get_dynamics_objfile (get_type_arch (type));
sym = allocate_symbol (objfile);
SYMBOL_SET_LANGUAGE (sym, language_java, &objfile->objfile_obstack);
SYMBOL_SET_LINKAGE_NAME (sym, TYPE_TAG_NAME (type));
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
/* SYMBOL_VALUE (sym) = valu; */
SYMBOL_TYPE (sym) = type;
SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
SYMBOL_VALUE_ADDRESS (sym) = addr;
return sym;
}
struct type *
java_lookup_class (char *name)
{
struct symbol *sym;
sym = lookup_symbol (name, expression_context_block, STRUCT_DOMAIN,
NULL).symbol;
if (sym != NULL)
return SYMBOL_TYPE (sym);
/* FIXME - should search inferior's symbol table. */
return NULL;
}
/* Return a nul-terminated string (allocated on OBSTACK) for
a name given by NAME (which has type Utf8Const*). */
char *
get_java_utf8_name (struct obstack *obstack, struct value *name)
{
char *chrs;
struct value *temp = name;
int name_length;
CORE_ADDR data_addr;
temp = value_struct_elt (&temp, NULL, "length", NULL, "structure");
name_length = (int) value_as_long (temp);
data_addr = value_address (temp) + TYPE_LENGTH (value_type (temp));
chrs = obstack_alloc (obstack, name_length + 1);
chrs[name_length] = '\0';
read_memory (data_addr, (gdb_byte *) chrs, name_length);
return chrs;
}
struct value *
java_class_from_object (struct value *obj_val)
{
/* This is all rather inefficient, since the offsets of vtable and
class are fixed. FIXME */
struct value *vtable_val;
if (TYPE_CODE (value_type (obj_val)) == TYPE_CODE_PTR
&& TYPE_LENGTH (TYPE_TARGET_TYPE (value_type (obj_val))) == 0)
obj_val = value_at (get_java_object_type (),
value_as_address (obj_val));
vtable_val = value_struct_elt (&obj_val, NULL, "vtable", NULL, "structure");
return value_struct_elt (&vtable_val, NULL, "class", NULL, "structure");
}
/* Check if CLASS_IS_PRIMITIVE(value of clas): */
static int
java_class_is_primitive (struct value *clas)
{
struct value *vtable = value_struct_elt (&clas, NULL, "vtable",
NULL, "struct");
CORE_ADDR i = value_as_address (vtable);
return (int) (i & 0x7fffffff) == (int) 0x7fffffff;
}
/* Read a GCJ Class object, and generated a gdb (TYPE_CODE_STRUCT) type. */
struct type *
type_from_class (struct gdbarch *gdbarch, struct value *clas)
{
struct type *type;
char *name;
struct value *temp;
struct objfile *objfile;
struct value *utf8_name;
char *nptr;
CORE_ADDR addr;
type = check_typedef (value_type (clas));
if (TYPE_CODE (type) == TYPE_CODE_PTR)
{
if (value_logical_not (clas))
return NULL;
clas = value_ind (clas);
}
addr = value_address (clas);
objfile = get_dynamics_objfile (gdbarch);
if (java_class_is_primitive (clas))
{
struct value *sig;
temp = clas;
sig = value_struct_elt (&temp, NULL, "method_count", NULL, "structure");
return java_primitive_type (gdbarch, value_as_long (sig));
}
/* Get Class name. */
/* If clasloader non-null, prepend loader address. FIXME */
temp = clas;
utf8_name = value_struct_elt (&temp, NULL, "name", NULL, "structure");
name = get_java_utf8_name (&objfile->objfile_obstack, utf8_name);
for (nptr = name; *nptr != 0; nptr++)
{
if (*nptr == '/')
*nptr = '.';
}
type = java_lookup_class (name);
if (type != NULL)
return type;
type = alloc_type (objfile);
TYPE_CODE (type) = TYPE_CODE_STRUCT;
INIT_CPLUS_SPECIFIC (type);
if (name[0] == '[')
{
char *signature = name;
int namelen = java_demangled_signature_length (signature);
if (namelen > strlen (name))
name = obstack_alloc (&objfile->objfile_obstack, namelen + 1);
java_demangled_signature_copy (name, signature);
name[namelen] = '\0';
temp = clas;
/* Set array element type. */
temp = value_struct_elt (&temp, NULL, "methods", NULL, "structure");
deprecated_set_value_type (temp,
lookup_pointer_type (value_type (clas)));
TYPE_TARGET_TYPE (type) = type_from_class (gdbarch, temp);
}
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_TAG_NAME (type) = name;
add_class_symtab_symbol (add_class_symbol (type, addr));
return java_link_class_type (gdbarch, type, clas);
}
/* Fill in class TYPE with data from the CLAS value. */
static struct type *
java_link_class_type (struct gdbarch *gdbarch,
struct type *type, struct value *clas)
{
struct value *temp;
const char *unqualified_name;
const char *name = TYPE_TAG_NAME (type);
int ninterfaces, nfields, nmethods;
int type_is_object = 0;
struct fn_field *fn_fields;
struct fn_fieldlist *fn_fieldlists;
struct value *fields;
struct value *methods;
struct value *method = NULL;
struct value *field = NULL;
int i, j;
struct objfile *objfile = get_dynamics_objfile (gdbarch);
struct type *tsuper;
gdb_assert (name != NULL);
unqualified_name = strrchr (name, '.');
if (unqualified_name == NULL)
unqualified_name = name;
temp = clas;
temp = value_struct_elt (&temp, NULL, "superclass", NULL, "structure");
if (strcmp (name, "java.lang.Object") == 0)
{
tsuper = get_java_object_type ();
if (tsuper && TYPE_CODE (tsuper) == TYPE_CODE_PTR)
tsuper = TYPE_TARGET_TYPE (tsuper);
type_is_object = 1;
}
else
tsuper = type_from_class (gdbarch, temp);
#if 1
ninterfaces = 0;
#else
temp = clas;
ninterfaces = value_as_long (value_struct_elt (&temp, NULL, "interface_len",
NULL, "structure"));
#endif
TYPE_N_BASECLASSES (type) = (tsuper == NULL ? 0 : 1) + ninterfaces;
temp = clas;
nfields = value_as_long (value_struct_elt (&temp, NULL, "field_count",
NULL, "structure"));
nfields += TYPE_N_BASECLASSES (type);
nfields++; /* Add one for dummy "class" field. */
TYPE_NFIELDS (type) = nfields;
TYPE_FIELDS (type) = (struct field *)
TYPE_ALLOC (type, sizeof (struct field) * nfields);
memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
TYPE_FIELD_PRIVATE_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
TYPE_FIELD_PROTECTED_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
TYPE_FIELD_IGNORE_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *)
TYPE_ALLOC (type, B_BYTES (TYPE_N_BASECLASSES (type)));
B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), TYPE_N_BASECLASSES (type));
if (tsuper != NULL)
{
TYPE_BASECLASS (type, 0) = tsuper;
if (type_is_object)
SET_TYPE_FIELD_PRIVATE (type, 0);
}
i = strlen (name);
if (i > 2 && name[i - 1] == ']' && tsuper != NULL)
{
/* FIXME */
TYPE_LENGTH (type) = TYPE_LENGTH (tsuper) + 4; /* size with "length" */
}
else
{
temp = clas;
temp = value_struct_elt (&temp, NULL, "size_in_bytes",
NULL, "structure");
TYPE_LENGTH (type) = value_as_long (temp);
}
fields = NULL;
nfields--; /* First set up dummy "class" field. */
SET_FIELD_PHYSADDR (TYPE_FIELD (type, nfields), value_address (clas));
TYPE_FIELD_NAME (type, nfields) = "class";
TYPE_FIELD_TYPE (type, nfields) = value_type (clas);
SET_TYPE_FIELD_PRIVATE (type, nfields);
for (i = TYPE_N_BASECLASSES (type); i < nfields; i++)
{
int accflags;
int boffset;
if (fields == NULL)
{
temp = clas;
fields = value_struct_elt (&temp, NULL, "fields", NULL, "structure");
field = value_ind (fields);
}
else
{ /* Re-use field value for next field. */
CORE_ADDR addr
= value_address (field) + TYPE_LENGTH (value_type (field));
set_value_address (field, addr);
set_value_lazy (field, 1);
}
temp = field;
temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
TYPE_FIELD_NAME (type, i) =
get_java_utf8_name (&objfile->objfile_obstack, temp);
temp = field;
accflags = value_as_long (value_struct_elt (&temp, NULL, "accflags",
NULL, "structure"));
temp = field;
temp = value_struct_elt (&temp, NULL, "info", NULL, "structure");
boffset = value_as_long (value_struct_elt (&temp, NULL, "boffset",
NULL, "structure"));
if (accflags & 0x0001) /* public access */
{
/* ??? */
}
if (accflags & 0x0002) /* private access */
{
SET_TYPE_FIELD_PRIVATE (type, i);
}
if (accflags & 0x0004) /* protected access */
{
SET_TYPE_FIELD_PROTECTED (type, i);
}
if (accflags & 0x0008) /* ACC_STATIC */
SET_FIELD_PHYSADDR (TYPE_FIELD (type, i), boffset);
else
SET_FIELD_BITPOS (TYPE_FIELD (type, i), 8 * boffset);
if (accflags & 0x8000) /* FIELD_UNRESOLVED_FLAG */
{
TYPE_FIELD_TYPE (type, i) = get_java_object_type (); /* FIXME */
}
else
{
struct type *ftype;
temp = field;
temp = value_struct_elt (&temp, NULL, "type", NULL, "structure");
ftype = type_from_class (gdbarch, temp);
if (TYPE_CODE (ftype) == TYPE_CODE_STRUCT)
ftype = lookup_pointer_type (ftype);
TYPE_FIELD_TYPE (type, i) = ftype;
}
}
temp = clas;
nmethods = value_as_long (value_struct_elt (&temp, NULL, "method_count",
NULL, "structure"));
j = nmethods * sizeof (struct fn_field);
fn_fields = (struct fn_field *)
obstack_alloc (&objfile->objfile_obstack, j);
memset (fn_fields, 0, j);
fn_fieldlists = (struct fn_fieldlist *)
alloca (nmethods * sizeof (struct fn_fieldlist));
methods = NULL;
for (i = 0; i < nmethods; i++)
{
const char *mname;
int k;
if (methods == NULL)
{
temp = clas;
methods = value_struct_elt (&temp, NULL, "methods",
NULL, "structure");
method = value_ind (methods);
}
else
{ /* Re-use method value for next method. */
CORE_ADDR addr
= value_address (method) + TYPE_LENGTH (value_type (method));
set_value_address (method, addr);
set_value_lazy (method, 1);
}
/* Get method name. */
temp = method;
temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
mname = get_java_utf8_name (&objfile->objfile_obstack, temp);
if (strcmp (mname, "<init>") == 0)
mname = unqualified_name;
/* Check for an existing method with the same name.
* This makes building the fn_fieldslists an O(nmethods**2)
* operation. That could be using hashing, but I doubt it
* is worth it. Note that we do maintain the order of methods
* in the inferior's Method table (as long as that is grouped
* by method name), which I think is desirable. --PB */
for (k = 0, j = TYPE_NFN_FIELDS (type);;)
{
if (--j < 0)
{ /* No match - new method name. */
j = TYPE_NFN_FIELDS (type)++;
fn_fieldlists[j].name = mname;
fn_fieldlists[j].length = 1;
fn_fieldlists[j].fn_fields = &fn_fields[i];
k = i;
break;
}
if (strcmp (mname, fn_fieldlists[j].name) == 0)
{ /* Found an existing method with the same name. */
int l;
if (mname != unqualified_name)
obstack_free (&objfile->objfile_obstack, mname);
mname = fn_fieldlists[j].name;
fn_fieldlists[j].length++;
k = i - k; /* Index of new slot. */
/* Shift intervening fn_fields (between k and i) down. */
for (l = i; l > k; l--)
fn_fields[l] = fn_fields[l - 1];
for (l = TYPE_NFN_FIELDS (type); --l > j;)
fn_fieldlists[l].fn_fields++;
break;
}
k += fn_fieldlists[j].length;
}
fn_fields[k].physname = "";
fn_fields[k].is_stub = 1;
/* FIXME */
fn_fields[k].type = lookup_function_type
(builtin_java_type (gdbarch)->builtin_void);
TYPE_CODE (fn_fields[k].type) = TYPE_CODE_METHOD;
}
j = TYPE_NFN_FIELDS (type) * sizeof (struct fn_fieldlist);
TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
obstack_alloc (&objfile->objfile_obstack, j);
memcpy (TYPE_FN_FIELDLISTS (type), fn_fieldlists, j);
return type;
}
struct type *
get_java_object_type (void)
{
struct symbol *sym;
sym = lookup_symbol ("java.lang.Object", NULL, STRUCT_DOMAIN, NULL).symbol;
if (sym == NULL)
error (_("cannot find java.lang.Object"));
return SYMBOL_TYPE (sym);
}
int
get_java_object_header_size (struct gdbarch *gdbarch)
{
struct type *objtype = get_java_object_type ();
if (objtype == NULL)
return (2 * gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
else
return TYPE_LENGTH (objtype);
}
int
is_object_type (struct type *type)
{
type = check_typedef (type);
if (TYPE_CODE (type) == TYPE_CODE_PTR)
{
struct type *ttype = check_typedef (TYPE_TARGET_TYPE (type));
const char *name;
if (TYPE_CODE (ttype) != TYPE_CODE_STRUCT)
return 0;
while (TYPE_N_BASECLASSES (ttype) > 0)
ttype = TYPE_BASECLASS (ttype, 0);
name = TYPE_TAG_NAME (ttype);
if (name != NULL && strcmp (name, "java.lang.Object") == 0)
return 1;
name
= TYPE_NFIELDS (ttype) > 0 ? TYPE_FIELD_NAME (ttype, 0) : (char *) 0;
if (name != NULL && strcmp (name, "vtable") == 0)
return 1;
}
return 0;
}
struct type *
java_primitive_type (struct gdbarch *gdbarch, int signature)
{
const struct builtin_java_type *builtin = builtin_java_type (gdbarch);
switch (signature)
{
case 'B':
return builtin->builtin_byte;
case 'S':
return builtin->builtin_short;
case 'I':
return builtin->builtin_int;
case 'J':
return builtin->builtin_long;
case 'Z':
return builtin->builtin_boolean;
case 'C':
return builtin->builtin_char;
case 'F':
return builtin->builtin_float;
case 'D':
return builtin->builtin_double;
case 'V':
return builtin->builtin_void;
}
error (_("unknown signature '%c' for primitive type"), (char) signature);
}
/* If name[0 .. namelen-1] is the name of a primitive Java type,
return that type. Otherwise, return NULL. */
struct type *
java_primitive_type_from_name (struct gdbarch *gdbarch,
const char *name, int namelen)
{
const struct builtin_java_type *builtin = builtin_java_type (gdbarch);
switch (name[0])
{
case 'b':
if (namelen == 4 && memcmp (name, "byte", 4) == 0)
return builtin->builtin_byte;
if (namelen == 7 && memcmp (name, "boolean", 7) == 0)
return builtin->builtin_boolean;
break;
case 'c':
if (namelen == 4 && memcmp (name, "char", 4) == 0)
return builtin->builtin_char;
break;
case 'd':
if (namelen == 6 && memcmp (name, "double", 6) == 0)
return builtin->builtin_double;
break;
case 'f':
if (namelen == 5 && memcmp (name, "float", 5) == 0)
return builtin->builtin_float;
break;
case 'i':
if (namelen == 3 && memcmp (name, "int", 3) == 0)
return builtin->builtin_int;
break;
case 'l':
if (namelen == 4 && memcmp (name, "long", 4) == 0)
return builtin->builtin_long;
break;
case 's':
if (namelen == 5 && memcmp (name, "short", 5) == 0)
return builtin->builtin_short;
break;
case 'v':
if (namelen == 4 && memcmp (name, "void", 4) == 0)
return builtin->builtin_void;
break;
}
return NULL;
}
static char *
java_primitive_type_name (int signature)
{
switch (signature)
{
case 'B':
return "byte";
case 'S':
return "short";
case 'I':
return "int";
case 'J':
return "long";
case 'Z':
return "boolean";
case 'C':
return "char";
case 'F':
return "float";
case 'D':
return "double";
case 'V':
return "void";
}
error (_("unknown signature '%c' for primitive type"), (char) signature);
}
/* Return the length (in bytes) of demangled name of the Java type
signature string SIGNATURE. */
static int
java_demangled_signature_length (const char *signature)
{
int array = 0;
for (; *signature == '['; signature++)
array += 2; /* Two chars for "[]". */
switch (signature[0])
{
case 'L':
/* Subtract 2 for 'L' and ';'. */
return strlen (signature) - 2 + array;
default:
return strlen (java_primitive_type_name (signature[0])) + array;
}
}
/* Demangle the Java type signature SIGNATURE, leaving the result in
RESULT. */
static void
java_demangled_signature_copy (char *result, const char *signature)
{
int array = 0;
char *ptr;
int i;
while (*signature == '[')
{
array++;
signature++;
}
switch (signature[0])
{
case 'L':
/* Subtract 2 for 'L' and ';', but add 1 for final nul. */
signature++;
ptr = result;
for (; *signature != ';' && *signature != '\0'; signature++)
{
if (*signature == '/')
*ptr++ = '.';
else
*ptr++ = *signature;
}
break;
default:
ptr = java_primitive_type_name (signature[0]);
i = strlen (ptr);
strcpy (result, ptr);
ptr = result + i;
break;
}
while (--array >= 0)
{
*ptr++ = '[';
*ptr++ = ']';
}
}
/* Return the demangled name of the Java type signature string SIGNATURE,
as a freshly allocated copy. */
char *
java_demangle_type_signature (const char *signature)
{
int length = java_demangled_signature_length (signature);
char *result = xmalloc (length + 1);
java_demangled_signature_copy (result, signature);
result[length] = '\0';
return result;
}
/* Return the type of TYPE followed by DIMS pairs of [ ].
If DIMS == 0, TYPE is returned. */
struct type *
java_array_type (struct type *type, int dims)
{
while (dims-- > 0)
{
/* FIXME This is bogus! Java arrays are not gdb arrays! */
type = lookup_array_range_type (type, 0, 0);
}
return type;
}
/* Create a Java string in the inferior from a (Utf8) literal. */
static struct value *
java_value_string (char *ptr, int len)
{
error (_("not implemented - java_value_string")); /* FIXME */
}
/* Return the encoding that should be used for the character type
TYPE. */
static const char *
java_get_encoding (struct type *type)
{
struct gdbarch *arch = get_type_arch (type);
const char *encoding;
if (type == builtin_java_type (arch)->builtin_char)
{
if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG)
encoding = "UTF-16BE";
else
encoding = "UTF-16LE";
}
else
encoding = target_charset (arch);
return encoding;
}
/* 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
java_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
{
const char *encoding = java_get_encoding (type);
generic_emit_char (c, type, stream, quoter, encoding);
}
/* Implementation of la_printchar method. */
static void
java_printchar (int c, struct type *type, struct ui_file *stream)
{
fputs_filtered ("'", stream);
LA_EMIT_CHAR (c, type, stream, '\'');
fputs_filtered ("'", stream);
}
/* Implementation of la_printstr method. */
static void
java_printstr (struct ui_file *stream, struct type *type,
const gdb_byte *string,
unsigned int length, const char *encoding, int force_ellipses,
const struct value_print_options *options)
{
const char *type_encoding = java_get_encoding (type);
if (!encoding || !*encoding)
encoding = type_encoding;
generic_printstr (stream, type, string, length, encoding,
force_ellipses, '"', 0, options);
}
static struct value *
evaluate_subexp_java (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
{
int pc = *pos;
int i;
const char *name;
enum exp_opcode op = exp->elts[*pos].opcode;
struct value *arg1;
struct value *arg2;
struct type *type;
switch (op)
{
case UNOP_IND:
if (noside == EVAL_SKIP)
goto standard;
(*pos)++;
arg1 = evaluate_subexp_java (NULL_TYPE, exp, pos, EVAL_NORMAL);
if (is_object_type (value_type (arg1)))
{
struct type *type;
type = type_from_class (exp->gdbarch, java_class_from_object (arg1));
arg1 = value_cast (lookup_pointer_type (type), arg1);
}
return value_ind (arg1);
case BINOP_SUBSCRIPT:
(*pos)++;
arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
if (noside == EVAL_SKIP)
goto nosideret;
/* If the user attempts to subscript something that is not an
array or pointer type (like a plain int variable for example),
then report this as an error. */
arg1 = coerce_ref (arg1);
type = check_typedef (value_type (arg1));
if (TYPE_CODE (type) == TYPE_CODE_PTR)
type = check_typedef (TYPE_TARGET_TYPE (type));
name = TYPE_NAME (type);
if (name == NULL)
name = TYPE_TAG_NAME (type);
i = name == NULL ? 0 : strlen (name);
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
&& i > 2 && name[i - 1] == ']')
{
enum bfd_endian byte_order = gdbarch_byte_order (exp->gdbarch);
CORE_ADDR address;
long length, index;
struct type *el_type;
gdb_byte buf4[4];
struct value *clas = java_class_from_object (arg1);
struct value *temp = clas;
/* Get CLASS_ELEMENT_TYPE of the array type. */
temp = value_struct_elt (&temp, NULL, "methods",
NULL, "structure");
deprecated_set_value_type (temp, value_type (clas));
el_type = type_from_class (exp->gdbarch, temp);
if (TYPE_CODE (el_type) == TYPE_CODE_STRUCT)
el_type = lookup_pointer_type (el_type);
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (el_type, VALUE_LVAL (arg1));
address = value_as_address (arg1);
address += get_java_object_header_size (exp->gdbarch);
read_memory (address, buf4, 4);
length = (long) extract_signed_integer (buf4, 4, byte_order);
index = (long) value_as_long (arg2);
if (index >= length || index < 0)
error (_("array index (%ld) out of bounds (length: %ld)"),
index, length);
address = (address + 4) + index * TYPE_LENGTH (el_type);
return value_at (el_type, address);
}
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
else
return value_subscript (arg1, value_as_long (arg2));
}
if (name)
error (_("cannot subscript something of type `%s'"), name);
else
error (_("cannot subscript requested type"));
case OP_STRING:
(*pos)++;
i = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (i + 1);
if (noside == EVAL_SKIP)
goto nosideret;
return java_value_string (&exp->elts[pc + 2].string, i);
case STRUCTOP_PTR:
arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside);
/* Convert object field (such as TYPE.class) to reference. */