/* Evaluate a location description, starting at DATA and with length
SIZE, to find the current location of variable VAR in the context
of FRAME. */
static struct value *
dwarf2_evaluate_loc_desc (struct symbol *var, struct frame_info *frame,
unsigned char *data, unsigned short size,
struct objfile *objfile)
{
CORE_ADDR result;
struct value *retval;
struct dwarf_expr_baton baton;
struct dwarf_expr_context *ctx;
if (size == 0)
{
retval = allocate_value (SYMBOL_TYPE (var));
VALUE_LVAL (retval) = not_lval;
VALUE_OPTIMIZED_OUT (retval) = 1;
}
baton.frame = frame;
baton.objfile = objfile;
ctx = new_dwarf_expr_context ();
ctx->baton = &baton;
ctx->read_reg = dwarf_expr_read_reg;
ctx->read_mem = dwarf_expr_read_mem;
ctx->get_frame_base = dwarf_expr_frame_base;
ctx->get_tls_address = dwarf_expr_tls_address;
dwarf_expr_eval (ctx, data, size);
result = dwarf_expr_fetch (ctx, 0);
if (ctx->in_reg)
{
int regnum = DWARF2_REG_TO_REGNUM (result);
retval = value_from_register (SYMBOL_TYPE (var), regnum, frame);
}
else
{
retval = allocate_value (SYMBOL_TYPE (var));
VALUE_BFD_SECTION (retval) = SYMBOL_BFD_SECTION (var);
VALUE_LVAL (retval) = lval_memory;
VALUE_LAZY (retval) = 1;
VALUE_ADDRESS (retval) = result;
}
free_dwarf_expr_context (ctx);
return retval;
}
struct value *
value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
{
struct type *array_type = check_typedef (value_type (array));
struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
ULONGEST elt_size = type_length_units (elt_type);
ULONGEST elt_offs = elt_size * (index - lowerbound);
if (index < lowerbound
|| (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
&& elt_offs >= type_length_units (array_type))
|| (VALUE_LVAL (array) != lval_memory
&& TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)))
{
if (type_not_associated (array_type))
error (_("no such vector element (vector not associated)"));
else if (type_not_allocated (array_type))
error (_("no such vector element (vector not allocated)"));
else
error (_("no such vector element"));
}
if (is_dynamic_type (elt_type))
{
CORE_ADDR address;
address = value_address (array) + elt_offs;
elt_type = resolve_dynamic_type (elt_type, NULL, address);
}
return value_from_component (array, elt_type, elt_offs);
}
void
info_mach_region_command (char *exp, int from_tty)
{
struct expression *expr;
struct value *val;
vm_address_t address;
expr = parse_expression (exp);
val = evaluate_expression (expr);
if (TYPE_CODE (value_type (val)) == TYPE_CODE_REF)
{
val = value_ind (val);
}
/* In rvalue contexts, such as this, functions are coerced into
pointers to functions. */
if (TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC
&& VALUE_LVAL (val) == lval_memory)
{
address = VALUE_ADDRESS (val);
}
else
{
address = value_as_address (val);
}
if ((!macosx_status) || (macosx_status->task == TASK_NULL))
{
error ("Inferior not available");
}
macosx_debug_region (macosx_status->task, address);
}
struct value *
value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
{
struct type *array_type = check_typedef (value_type (array));
struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
unsigned int elt_size = TYPE_LENGTH (elt_type);
unsigned int elt_offs = elt_size * longest_to_int (index - lowerbound);
struct value *v;
if (index < lowerbound || (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
&& elt_offs >= TYPE_LENGTH (array_type)))
error (_("no such vector element"));
if (VALUE_LVAL (array) == lval_memory && value_lazy (array))
v = allocate_value_lazy (elt_type);
else
{
v = allocate_value (elt_type);
value_contents_copy (v, value_embedded_offset (v),
array, value_embedded_offset (array) + elt_offs,
elt_size);
}
set_value_component_location (v, array);
VALUE_REGNUM (v) = VALUE_REGNUM (array);
VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
set_value_offset (v, value_offset (array) + elt_offs);
return v;
}
struct value *
value_ptradd (struct value *arg1, LONGEST arg2)
{
struct type *valptrtype;
LONGEST sz;
struct value *result;
arg1 = coerce_array (arg1);
valptrtype = check_typedef (value_type (arg1));
sz = find_size_for_pointer_math (valptrtype);
result = value_from_pointer (valptrtype,
value_as_address (arg1) + sz * arg2);
if (VALUE_LVAL (result) != lval_internalvar)
set_value_component_location (result, arg1);
return result;
}
static struct value *
value_of_builtin_frame_reg (struct frame_info *frame)
{
struct value *val;
gdb_byte *buf;
build_builtin_type_frame_reg ();
val = allocate_value (builtin_type_frame_reg);
VALUE_LVAL (val) = not_lval;
buf = value_contents_raw (val);
memset (buf, 0, TYPE_LENGTH (value_type (val)));
/* frame.base. */
if (frame != NULL)
ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
get_frame_base (frame));
buf += TYPE_LENGTH (builtin_type_void_data_ptr);
/* frame.XXX. */
return val;
}
/* FIXME: needs comment: */
static void
dump_value_to_file(const char *cmd, const char *mode, const char *file_format)
{
struct cleanup *old_cleanups = make_cleanup(null_cleanup, NULL);
struct value *val;
char *filename;
/* Open the file. */
filename = scan_filename_with_cleanup(&cmd, NULL);
/* Find the value: */
if ((cmd == NULL) || (*cmd == '\0'))
error(_("No value to %s."), ((*mode == 'a') ? "append" : "dump"));
val = parse_and_eval(cmd);
if (val == NULL)
error(_("Invalid expression."));
/* Have everything. Open/write the data: */
if ((file_format == NULL) || (strcmp(file_format, "binary") == 0))
{
dump_binary_file(filename, mode, value_contents(val),
TYPE_LENGTH(value_type(val)));
}
else
{
CORE_ADDR vaddr;
if (VALUE_LVAL(val))
{
vaddr = VALUE_ADDRESS(val);
}
else
{
vaddr = 0;
warning(_("value is not an lval: address assumed to be zero"));
}
dump_bfd_file(filename, mode, file_format, vaddr,
value_contents(val),
TYPE_LENGTH(value_type(val)));
}
do_cleanups(old_cleanups);
}
struct value *
value_subscript (struct value *array, LONGEST index)
{
int c_style = current_language->c_style_arrays;
struct type *tarray;
array = coerce_ref (array);
tarray = check_typedef (value_type (array));
if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
|| TYPE_CODE (tarray) == TYPE_CODE_STRING)
{
struct type *range_type = TYPE_INDEX_TYPE (tarray);
LONGEST lowerbound, upperbound;
get_discrete_bounds (range_type, &lowerbound, &upperbound);
if (VALUE_LVAL (array) != lval_memory)
return value_subscripted_rvalue (array, index, lowerbound);
if (c_style == 0)
{
if (index >= lowerbound && index <= upperbound)
return value_subscripted_rvalue (array, index, lowerbound);
/* Emit warning unless we have an array of unknown size.
An array of unknown size has lowerbound 0 and upperbound -1. */
if (upperbound > -1)
warning (_("array or string index out of range"));
/* fall doing C stuff */
c_style = 1;
}
index -= lowerbound;
array = value_coerce_array (array);
}
if (c_style)
return value_ind (value_ptradd (array, index));
else
error (_("not an array or string"));
}
/* Return the value of SYMBOL in FRAME using the DWARF-2 expression
evaluator to calculate the location. */
static struct value *
loclist_read_variable (struct symbol *symbol, struct frame_info *frame)
{
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
struct value *val;
gdb_byte *data;
size_t size;
data = find_location_expression (dlbaton, &size,
frame ? get_frame_address_in_block (frame)
: 0);
if (data == NULL)
{
val = allocate_value (SYMBOL_TYPE (symbol));
VALUE_LVAL (val) = not_lval;
set_value_optimized_out (val, 1);
}
else
val = dwarf2_evaluate_loc_desc (symbol, frame, data, size,
dlbaton->objfile);
return val;
}
static void info_embedded_symbol_command (char *exp, int from_tty)
{
struct expression *expr;
struct value *val;
CORE_ADDR address;
struct embedded_symbol *sym;
expr = parse_expression (exp);
val = evaluate_expression (expr);
if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_REF)
val = value_ind (val);
if ((TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC) && (VALUE_LVAL (val) == lval_memory))
address = VALUE_ADDRESS (val);
else
address = value_as_address (val);
sym = search_for_embedded_symbol (address);
if (sym != NULL)
fprintf_unfiltered
(gdb_stderr, "Symbol at 0x%lx is \"%s\".\n", (unsigned long) address, sym->name);
else
fprintf_unfiltered
(gdb_stderr, "Symbol at 0x%lx is unknown.\n", (unsigned long) address);
}
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. */
if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_STRUCT)
arg1 = value_addr (arg1);
return arg1;
default:
break;
}
standard:
return evaluate_subexp_standard (expect_type, exp, pos, noside);
nosideret:
return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
}
enum ext_lang_rc
gdbscm_apply_val_pretty_printer (const struct extension_language_defn *extlang,
struct type *type, const gdb_byte *valaddr,
int embedded_offset, CORE_ADDR address,
struct ui_file *stream, int recurse,
const struct value *val,
const struct value_print_options *options,
const struct language_defn *language)
{
struct gdbarch *gdbarch = get_type_arch (type);
SCM exception = SCM_BOOL_F;
SCM printer = SCM_BOOL_F;
SCM val_obj = SCM_BOOL_F;
struct value *value;
enum display_hint hint;
struct cleanup *cleanups;
enum ext_lang_rc result = EXT_LANG_RC_NOP;
enum string_repr_result print_result;
/* No pretty-printer support for unavailable values. */
if (!value_bytes_available (val, embedded_offset, TYPE_LENGTH (type)))
return EXT_LANG_RC_NOP;
if (!gdb_scheme_initialized)
return EXT_LANG_RC_NOP;
cleanups = make_cleanup (null_cleanup, NULL);
/* Instantiate the printer. */
if (valaddr)
valaddr += embedded_offset;
value = value_from_contents_and_address (type, valaddr,
address + embedded_offset);
set_value_component_location (value, val);
/* set_value_component_location resets the address, so we may
need to set it again. */
if (VALUE_LVAL (value) != lval_internalvar
&& VALUE_LVAL (value) != lval_internalvar_component
&& VALUE_LVAL (value) != lval_computed)
set_value_address (value, address + embedded_offset);
val_obj = vlscm_scm_from_value (value);
if (gdbscm_is_exception (val_obj))
{
exception = val_obj;
result = EXT_LANG_RC_ERROR;
goto done;
}
printer = ppscm_find_pretty_printer (val_obj);
if (gdbscm_is_exception (printer))
{
exception = printer;
result = EXT_LANG_RC_ERROR;
goto done;
}
if (gdbscm_is_false (printer))
{
result = EXT_LANG_RC_NOP;
goto done;
}
gdb_assert (ppscm_is_pretty_printer_worker (printer));
/* If we are printing a map, we want some special formatting. */
hint = ppscm_get_display_hint_enum (printer);
if (hint == HINT_ERROR)
{
/* Print the error as an exception for consistency. */
SCM hint_scm = ppscm_get_display_hint_scm (printer);
ppscm_print_pp_type_error ("Invalid display hint", hint_scm);
/* Fall through. A bad hint doesn't stop pretty-printing. */
hint = HINT_NONE;
}
/* Print the section. */
print_result = ppscm_print_string_repr (printer, hint, stream, recurse,
options, gdbarch, language);
if (print_result != STRING_REPR_ERROR)
{
ppscm_print_children (printer, hint, stream, recurse, options,
gdbarch, language,
print_result == STRING_REPR_NONE);
}
result = EXT_LANG_RC_OK;
done:
if (gdbscm_is_exception (exception))
ppscm_print_exception_unless_memory_error (exception, stream);
do_cleanups (cleanups);
return result;
}
struct value *
value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
enum exp_opcode otherop, enum noside noside)
{
char *ptr;
char tstr[13];
int static_memfuncp;
arg1 = coerce_ref (arg1);
arg2 = coerce_ref (arg2);
/* now we know that what we have to do is construct our
arg vector and find the right function to call it with. */
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
error (_("Can't do that binary op on that type")); /* FIXME be explicit */
value *argvec_storage[3];
gdb::array_view<value *> argvec = argvec_storage;
argvec[1] = value_addr (arg1);
argvec[2] = arg2;
/* Make the right function name up. */
strcpy (tstr, "operator__");
ptr = tstr + 8;
switch (op)
{
case BINOP_ADD:
strcpy (ptr, "+");
break;
case BINOP_SUB:
strcpy (ptr, "-");
break;
case BINOP_MUL:
strcpy (ptr, "*");
break;
case BINOP_DIV:
strcpy (ptr, "/");
break;
case BINOP_REM:
strcpy (ptr, "%");
break;
case BINOP_LSH:
strcpy (ptr, "<<");
break;
case BINOP_RSH:
strcpy (ptr, ">>");
break;
case BINOP_BITWISE_AND:
strcpy (ptr, "&");
break;
case BINOP_BITWISE_IOR:
strcpy (ptr, "|");
break;
case BINOP_BITWISE_XOR:
strcpy (ptr, "^");
break;
case BINOP_LOGICAL_AND:
strcpy (ptr, "&&");
break;
case BINOP_LOGICAL_OR:
strcpy (ptr, "||");
break;
case BINOP_MIN:
strcpy (ptr, "<?");
break;
case BINOP_MAX:
strcpy (ptr, ">?");
break;
case BINOP_ASSIGN:
strcpy (ptr, "=");
break;
case BINOP_ASSIGN_MODIFY:
switch (otherop)
{
case BINOP_ADD:
strcpy (ptr, "+=");
break;
case BINOP_SUB:
strcpy (ptr, "-=");
break;
case BINOP_MUL:
strcpy (ptr, "*=");
break;
case BINOP_DIV:
strcpy (ptr, "/=");
break;
case BINOP_REM:
strcpy (ptr, "%=");
break;
case BINOP_BITWISE_AND:
strcpy (ptr, "&=");
break;
case BINOP_BITWISE_IOR:
strcpy (ptr, "|=");
break;
case BINOP_BITWISE_XOR:
strcpy (ptr, "^=");
break;
case BINOP_MOD: /* invalid */
default:
error (_("Invalid binary operation specified."));
}
break;
case BINOP_SUBSCRIPT:
strcpy (ptr, "[]");
break;
case BINOP_EQUAL:
strcpy (ptr, "==");
break;
case BINOP_NOTEQUAL:
strcpy (ptr, "!=");
break;
case BINOP_LESS:
strcpy (ptr, "<");
break;
case BINOP_GTR:
strcpy (ptr, ">");
break;
case BINOP_GEQ:
strcpy (ptr, ">=");
break;
case BINOP_LEQ:
strcpy (ptr, "<=");
break;
case BINOP_MOD: /* invalid */
default:
error (_("Invalid binary operation specified."));
}
argvec[0] = value_user_defined_op (&arg1, argvec.slice (1), tstr,
&static_memfuncp, noside);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
argvec = argvec.slice (1);
}
if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
{
/* Static xmethods are not supported yet. */
gdb_assert (static_memfuncp == 0);
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type
= result_type_of_xmethod (argvec[0], argvec.slice (1));
if (return_type == NULL)
error (_("Xmethod is missing return type."));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_xmethod (argvec[0], argvec.slice (1));
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type;
return_type
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_function_by_hand (argvec[0], NULL,
argvec.slice (1, 2 - static_memfuncp));
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
}
static void
convert_one_symbol (struct compile_c_instance *context,
struct symbol *sym,
int is_global,
int is_local)
{
gcc_type sym_type;
const char *filename = symbol_symtab (sym)->filename;
unsigned short line = SYMBOL_LINE (sym);
error_symbol_once (context, sym);
if (SYMBOL_CLASS (sym) == LOC_LABEL)
sym_type = 0;
else
sym_type = convert_type (context, SYMBOL_TYPE (sym));
if (SYMBOL_DOMAIN (sym) == STRUCT_DOMAIN)
{
/* Binding a tag, so we don't need to build a decl. */
C_CTX (context)->c_ops->tagbind (C_CTX (context),
SYMBOL_NATURAL_NAME (sym),
sym_type, filename, line);
}
else
{
gcc_decl decl;
enum gcc_c_symbol_kind kind;
CORE_ADDR addr = 0;
char *symbol_name = NULL;
switch (SYMBOL_CLASS (sym))
{
case LOC_TYPEDEF:
kind = GCC_C_SYMBOL_TYPEDEF;
break;
case LOC_LABEL:
kind = GCC_C_SYMBOL_LABEL;
addr = SYMBOL_VALUE_ADDRESS (sym);
break;
case LOC_BLOCK:
kind = GCC_C_SYMBOL_FUNCTION;
addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
break;
case LOC_CONST:
if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_ENUM)
{
/* Already handled by convert_enum. */
return;
}
C_CTX (context)->c_ops->build_constant (C_CTX (context), sym_type,
SYMBOL_NATURAL_NAME (sym),
SYMBOL_VALUE (sym),
filename, line);
return;
case LOC_CONST_BYTES:
error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."),
SYMBOL_PRINT_NAME (sym));
case LOC_UNDEF:
internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."),
SYMBOL_PRINT_NAME (sym));
case LOC_COMMON_BLOCK:
error (_("Fortran common block is unsupported for compilation "
"evaluaton of symbol \"%s\"."),
SYMBOL_PRINT_NAME (sym));
case LOC_OPTIMIZED_OUT:
error (_("Symbol \"%s\" cannot be used for compilation evaluation "
"as it is optimized out."),
SYMBOL_PRINT_NAME (sym));
case LOC_COMPUTED:
if (is_local)
goto substitution;
/* Probably TLS here. */
warning (_("Symbol \"%s\" is thread-local and currently can only "
"be referenced from the current thread in "
"compiled code."),
SYMBOL_PRINT_NAME (sym));
/* FALLTHROUGH */
case LOC_UNRESOLVED:
/* 'symbol_name' cannot be used here as that one is used only for
local variables from compile_dwarf_expr_to_c.
Global variables can be accessed by GCC only by their address, not
by their name. */
{
struct value *val;
struct frame_info *frame = NULL;
if (symbol_read_needs_frame (sym))
{
frame = get_selected_frame (NULL);
if (frame == NULL)
error (_("Symbol \"%s\" cannot be used because "
"there is no selected frame"),
SYMBOL_PRINT_NAME (sym));
}
val = read_var_value (sym, frame);
if (VALUE_LVAL (val) != lval_memory)
error (_("Symbol \"%s\" cannot be used for compilation "
"evaluation as its address has not been found."),
SYMBOL_PRINT_NAME (sym));
kind = GCC_C_SYMBOL_VARIABLE;
addr = value_address (val);
}
break;
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
case LOC_REGPARM_ADDR:
case LOC_LOCAL:
substitution:
kind = GCC_C_SYMBOL_VARIABLE;
symbol_name = symbol_substitution_name (sym);
break;
case LOC_STATIC:
kind = GCC_C_SYMBOL_VARIABLE;
addr = SYMBOL_VALUE_ADDRESS (sym);
break;
case LOC_FINAL_VALUE:
default:
gdb_assert_not_reached ("Unreachable case in convert_one_symbol.");
}
/* Don't emit local variable decls for a raw expression. */
if (context->base.scope != COMPILE_I_RAW_SCOPE
|| symbol_name == NULL)
{
decl = C_CTX (context)->c_ops->build_decl (C_CTX (context),
SYMBOL_NATURAL_NAME (sym),
kind,
sym_type,
symbol_name, addr,
filename, line);
C_CTX (context)->c_ops->bind (C_CTX (context), decl, is_global);
}
xfree (symbol_name);
}
}
static struct value *
evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
{
enum exp_opcode op = exp->elts[*pos].opcode;
struct value *arg1;
struct value *arg2;
struct type *type;
switch (op)
{
case UNOP_HIGH:
(*pos)++;
arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
return arg1;
else
{
arg1 = coerce_ref (arg1);
type = check_typedef (value_type (arg1));
if (m2_is_unbounded_array (type))
{
struct value *temp = arg1;
type = TYPE_FIELD_TYPE (type, 1);
/* i18n: Do not translate the "_m2_high" part! */
arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
_("unbounded structure "
"missing _m2_high field"));
if (value_type (arg1) != type)
arg1 = value_cast (type, arg1);
}
}
return 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 (m2_is_unbounded_array (type))
{
struct value *temp = arg1;
type = TYPE_FIELD_TYPE (type, 0);
if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR))
{
warning (_("internal error: unbounded "
"array structure is unknown"));
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
/* i18n: Do not translate the "_m2_contents" part! */
arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
_("unbounded structure "
"missing _m2_contents field"));
if (value_type (arg1) != type)
arg1 = value_cast (type, arg1);
check_typedef (value_type (arg1));
return value_ind (value_ptradd (arg1, value_as_long (arg2)));
}
else
if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
{
if (TYPE_NAME (type))
error (_("cannot subscript something of type `%s'"),
TYPE_NAME (type));
else
error (_("cannot subscript requested type"));
}
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));
default:
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
nosideret:
return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
}
/* Evaluate a location description, starting at DATA and with length
SIZE, to find the current location of variable VAR in the context
of FRAME. */
static struct value *
dwarf2_evaluate_loc_desc (struct symbol *var, struct frame_info *frame,
gdb_byte *data, unsigned short size,
struct objfile *objfile)
{
struct gdbarch *arch = get_frame_arch (frame);
struct value *retval;
struct dwarf_expr_baton baton;
struct dwarf_expr_context *ctx;
if (size == 0)
{
retval = allocate_value (SYMBOL_TYPE (var));
VALUE_LVAL (retval) = not_lval;
set_value_optimized_out (retval, 1);
return retval;
}
baton.frame = frame;
baton.objfile = objfile;
ctx = new_dwarf_expr_context ();
ctx->baton = &baton;
ctx->read_reg = dwarf_expr_read_reg;
ctx->read_mem = dwarf_expr_read_mem;
ctx->get_frame_base = dwarf_expr_frame_base;
ctx->get_tls_address = dwarf_expr_tls_address;
dwarf_expr_eval (ctx, data, size);
if (ctx->num_pieces > 0)
{
int i;
long offset = 0;
bfd_byte *contents;
retval = allocate_value (SYMBOL_TYPE (var));
contents = value_contents_raw (retval);
for (i = 0; i < ctx->num_pieces; i++)
{
struct dwarf_expr_piece *p = &ctx->pieces[i];
if (p->in_reg)
{
bfd_byte regval[MAX_REGISTER_SIZE];
int gdb_regnum = gdbarch_dwarf2_reg_to_regnum
(arch, p->value);
get_frame_register (frame, gdb_regnum, regval);
memcpy (contents + offset, regval, p->size);
}
else /* In memory? */
{
read_memory (p->value, contents + offset, p->size);
}
offset += p->size;
}
}
else if (ctx->in_reg)
{
CORE_ADDR dwarf_regnum = dwarf_expr_fetch (ctx, 0);
int gdb_regnum = gdbarch_dwarf2_reg_to_regnum
(arch, dwarf_regnum);
retval = value_from_register (SYMBOL_TYPE (var), gdb_regnum, frame);
}
else
{
CORE_ADDR address = dwarf_expr_fetch (ctx, 0);
retval = allocate_value (SYMBOL_TYPE (var));
VALUE_LVAL (retval) = lval_memory;
set_value_lazy (retval, 1);
VALUE_ADDRESS (retval) = address;
}
set_value_initialized (retval, ctx->initialized);
free_dwarf_expr_context (ctx);
return retval;
}
CORE_ADDR
find_function_addr (struct value *function, struct type **retval_type)
{
struct type *ftype = check_typedef (value_type (function));
struct gdbarch *gdbarch = get_type_arch (ftype);
struct type *value_type = NULL;
/* Initialize it just to avoid a GCC false warning. */
CORE_ADDR funaddr = 0;
/* If it's a member function, just look at the function
part of it. */
/* Determine address to call. */
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
funaddr = value_address (function);
else if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
{
funaddr = value_as_address (function);
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
¤t_target);
}
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
{
value_type = TYPE_TARGET_TYPE (ftype);
if (TYPE_GNU_IFUNC (ftype))
{
funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr);
/* Skip querying the function symbol if no RETVAL_TYPE has been
asked for. */
if (retval_type)
value_type = find_function_return_type (funaddr);
}
}
else if (TYPE_CODE (ftype) == TYPE_CODE_INT)
{
/* Handle the case of functions lacking debugging info.
Their values are characters since their addresses are char. */
if (TYPE_LENGTH (ftype) == 1)
funaddr = value_as_address (value_addr (function));
else
{
/* Handle function descriptors lacking debug info. */
int found_descriptor = 0;
funaddr = 0; /* pacify "gcc -Werror" */
if (VALUE_LVAL (function) == lval_memory)
{
CORE_ADDR nfunaddr;
funaddr = value_as_address (value_addr (function));
nfunaddr = funaddr;
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
¤t_target);
if (funaddr != nfunaddr)
found_descriptor = 1;
}
if (!found_descriptor)
/* Handle integer used as address of a function. */
funaddr = (CORE_ADDR) value_as_long (function);
}
}
else
error (_("Invalid data type for function to be called."));
if (retval_type != NULL)
*retval_type = value_type;
return funaddr + gdbarch_deprecated_function_start_offset (gdbarch);
}
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 = xmalloc (*length);
memcpy (*buffer, contents, *length);
err = 0;
}
else
{
CORE_ADDR addr = value_as_address (value);
err = read_string (addr, *length, width, fetchlimit,
byte_order, buffer, length);
if (err)
{
xfree (*buffer);
memory_error (err, 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:
{
char *type_str;
type_str = type_to_string (type);
if (type_str)
{
make_cleanup (xfree, type_str);
error (_("Trying to read string with inappropriate type `%s'."),
type_str);
}
else
error (_("Trying to read string with inappropriate type."));
}
}
struct value *
value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
{
struct gdbarch *gdbarch = get_type_arch (value_type (arg1));
char *ptr;
char tstr[13], mangle_tstr[13];
int static_memfuncp, nargs;
arg1 = coerce_ref (arg1);
/* now we know that what we have to do is construct our
arg vector and find the right function to call it with. */
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
error (_("Can't do that unary op on that type")); /* FIXME be explicit */
value *argvec_storage[3];
gdb::array_view<value *> argvec = argvec_storage;
argvec[1] = value_addr (arg1);
argvec[2] = 0;
nargs = 1;
/* Make the right function name up. */
strcpy (tstr, "operator__");
ptr = tstr + 8;
strcpy (mangle_tstr, "__");
switch (op)
{
case UNOP_PREINCREMENT:
strcpy (ptr, "++");
break;
case UNOP_PREDECREMENT:
strcpy (ptr, "--");
break;
case UNOP_POSTINCREMENT:
strcpy (ptr, "++");
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
nargs ++;
break;
case UNOP_POSTDECREMENT:
strcpy (ptr, "--");
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
nargs ++;
break;
case UNOP_LOGICAL_NOT:
strcpy (ptr, "!");
break;
case UNOP_COMPLEMENT:
strcpy (ptr, "~");
break;
case UNOP_NEG:
strcpy (ptr, "-");
break;
case UNOP_PLUS:
strcpy (ptr, "+");
break;
case UNOP_IND:
strcpy (ptr, "*");
break;
case STRUCTOP_PTR:
strcpy (ptr, "->");
break;
default:
error (_("Invalid unary operation specified."));
}
argvec[0] = value_user_defined_op (&arg1, argvec.slice (1, nargs), tstr,
&static_memfuncp, noside);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
argvec = argvec.slice (1);
}
if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
{
/* Static xmethods are not supported yet. */
gdb_assert (static_memfuncp == 0);
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type
= result_type_of_xmethod (argvec[0], argvec[1]);
if (return_type == NULL)
error (_("Xmethod is missing return type."));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_xmethod (argvec[0], argvec[1]);
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type;
return_type
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_function_by_hand (argvec[0], NULL,
argvec.slice (1, nargs));
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
}
struct value *
value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
enum exp_opcode otherop, enum noside noside)
{
struct value **argvec;
char *ptr;
char tstr[13];
int static_memfuncp;
arg1 = coerce_ref (arg1);
arg2 = coerce_ref (arg2);
/* now we know that what we have to do is construct our
arg vector and find the right function to call it with. */
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
error (_("Can't do that binary op on that type")); /* FIXME be explicit */
argvec = (struct value **) alloca (sizeof (struct value *) * 4);
argvec[1] = value_addr (arg1);
argvec[2] = arg2;
argvec[3] = 0;
/* Make the right function name up. */
strcpy (tstr, "operator__");
ptr = tstr + 8;
switch (op)
{
case BINOP_ADD:
strcpy (ptr, "+");
break;
case BINOP_SUB:
strcpy (ptr, "-");
break;
case BINOP_MUL:
strcpy (ptr, "*");
break;
case BINOP_DIV:
strcpy (ptr, "/");
break;
case BINOP_REM:
strcpy (ptr, "%");
break;
case BINOP_LSH:
strcpy (ptr, "<<");
break;
case BINOP_RSH:
strcpy (ptr, ">>");
break;
case BINOP_BITWISE_AND:
strcpy (ptr, "&");
break;
case BINOP_BITWISE_IOR:
strcpy (ptr, "|");
break;
case BINOP_BITWISE_XOR:
strcpy (ptr, "^");
break;
case BINOP_LOGICAL_AND:
strcpy (ptr, "&&");
break;
case BINOP_LOGICAL_OR:
strcpy (ptr, "||");
break;
case BINOP_MIN:
strcpy (ptr, "<?");
break;
case BINOP_MAX:
strcpy (ptr, ">?");
break;
case BINOP_ASSIGN:
strcpy (ptr, "=");
break;
case BINOP_ASSIGN_MODIFY:
switch (otherop)
{
case BINOP_ADD:
strcpy (ptr, "+=");
break;
case BINOP_SUB:
strcpy (ptr, "-=");
break;
case BINOP_MUL:
strcpy (ptr, "*=");
break;
case BINOP_DIV:
strcpy (ptr, "/=");
break;
case BINOP_REM:
strcpy (ptr, "%=");
break;
case BINOP_BITWISE_AND:
strcpy (ptr, "&=");
break;
case BINOP_BITWISE_IOR:
strcpy (ptr, "|=");
break;
case BINOP_BITWISE_XOR:
strcpy (ptr, "^=");
break;
case BINOP_MOD: /* invalid */
default:
error (_("Invalid binary operation specified."));
}
break;
case BINOP_SUBSCRIPT:
strcpy (ptr, "[]");
break;
case BINOP_EQUAL:
strcpy (ptr, "==");
break;
case BINOP_NOTEQUAL:
strcpy (ptr, "!=");
break;
case BINOP_LESS:
strcpy (ptr, "<");
break;
case BINOP_GTR:
strcpy (ptr, ">");
break;
case BINOP_GEQ:
strcpy (ptr, ">=");
break;
case BINOP_LEQ:
strcpy (ptr, "<=");
break;
case BINOP_MOD: /* invalid */
default:
error (_("Invalid binary operation specified."));
}
argvec[0] = value_user_defined_op (&arg1, argvec + 1, tstr,
&static_memfuncp, 2);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
argvec++;
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type;
return_type
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_function_by_hand (argvec[0], 2 - static_memfuncp,
argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
#ifdef lint
return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
#endif
}
enum ext_lang_rc
gdbpy_apply_val_pretty_printer (const struct extension_language_defn *extlang,
struct type *type, const gdb_byte *valaddr,
int embedded_offset, CORE_ADDR address,
struct ui_file *stream, int recurse,
const struct value *val,
const struct value_print_options *options,
const struct language_defn *language)
{
struct gdbarch *gdbarch = get_type_arch (type);
PyObject *printer = NULL;
PyObject *val_obj = NULL;
struct value *value;
char *hint = NULL;
struct cleanup *cleanups;
enum ext_lang_rc result = EXT_LANG_RC_NOP;
enum string_repr_result print_result;
/* No pretty-printer support for unavailable values. */
if (!value_bytes_available (val, embedded_offset, TYPE_LENGTH (type)))
return EXT_LANG_RC_NOP;
if (!gdb_python_initialized)
return EXT_LANG_RC_NOP;
cleanups = ensure_python_env (gdbarch, language);
/* Instantiate the printer. */
if (valaddr)
valaddr += embedded_offset;
value = value_from_contents_and_address (type, valaddr,
address + embedded_offset);
set_value_component_location (value, val);
/* set_value_component_location resets the address, so we may
need to set it again. */
if (VALUE_LVAL (value) != lval_internalvar
&& VALUE_LVAL (value) != lval_internalvar_component
&& VALUE_LVAL (value) != lval_computed)
set_value_address (value, address + embedded_offset);
val_obj = value_to_value_object (value);
if (! val_obj)
{
result = EXT_LANG_RC_ERROR;
goto done;
}
/* Find the constructor. */
printer = find_pretty_printer (val_obj);
Py_DECREF (val_obj);
if (printer == NULL)
{
result = EXT_LANG_RC_ERROR;
goto done;
}
make_cleanup_py_decref (printer);
if (printer == Py_None)
{
result = EXT_LANG_RC_NOP;
goto done;
}
/* If we are printing a map, we want some special formatting. */
hint = gdbpy_get_display_hint (printer);
make_cleanup (free_current_contents, &hint);
/* Print the section */
print_result = print_string_repr (printer, hint, stream, recurse,
options, language, gdbarch);
if (print_result != string_repr_error)
print_children (printer, hint, stream, recurse, options, language,
print_result == string_repr_none);
result = EXT_LANG_RC_OK;
done:
if (PyErr_Occurred ())
print_stack_unless_memory_error (stream);
do_cleanups (cleanups);
return result;
}
struct value *
value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
{
struct gdbarch *gdbarch = get_type_arch (value_type (arg1));
struct value **argvec;
char *ptr, *mangle_ptr;
char tstr[13], mangle_tstr[13];
int static_memfuncp, nargs;
arg1 = coerce_ref (arg1);
/* now we know that what we have to do is construct our
arg vector and find the right function to call it with. */
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
error (_("Can't do that unary op on that type")); /* FIXME be explicit */
argvec = (struct value **) alloca (sizeof (struct value *) * 4);
argvec[1] = value_addr (arg1);
argvec[2] = 0;
nargs = 1;
/* Make the right function name up. */
strcpy (tstr, "operator__");
ptr = tstr + 8;
strcpy (mangle_tstr, "__");
mangle_ptr = mangle_tstr + 2;
switch (op)
{
case UNOP_PREINCREMENT:
strcpy (ptr, "++");
break;
case UNOP_PREDECREMENT:
strcpy (ptr, "--");
break;
case UNOP_POSTINCREMENT:
strcpy (ptr, "++");
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
argvec[3] = 0;
nargs ++;
break;
case UNOP_POSTDECREMENT:
strcpy (ptr, "--");
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
argvec[3] = 0;
nargs ++;
break;
case UNOP_LOGICAL_NOT:
strcpy (ptr, "!");
break;
case UNOP_COMPLEMENT:
strcpy (ptr, "~");
break;
case UNOP_NEG:
strcpy (ptr, "-");
break;
case UNOP_PLUS:
strcpy (ptr, "+");
break;
case UNOP_IND:
strcpy (ptr, "*");
break;
case STRUCTOP_PTR:
strcpy (ptr, "->");
break;
default:
error (_("Invalid unary operation specified."));
}
argvec[0] = value_user_defined_op (&arg1, argvec + 1, tstr,
&static_memfuncp, nargs);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
nargs --;
argvec++;
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *return_type;
return_type
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
return call_function_by_hand (argvec[0], nargs, argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
return 0; /* For lint -- never reached */
}
void
c_get_string (struct value *value, gdb::unique_xmalloc_ptr<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->reset ((gdb_byte *) xmalloc (*length));
memcpy (buffer->get (), 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)
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->get () + *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."));
}
}
