/* Evaluate expressions for GDB.
- Copyright (C) 1986-2003, 2005-2012 Free Software Foundation, Inc.
+ Copyright (C) 1986-2014 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
+#include <string.h>
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "valprint.h"
#include "gdb_obstack.h"
#include "objfiles.h"
-#include "python/python.h"
#include "gdb_assert.h"
static struct value *evaluate_subexp_for_address (struct expression *,
int *, enum noside);
-static char *get_label (struct expression *, int *);
-
static struct value *evaluate_struct_tuple (struct value *,
struct expression *, int *,
enum noside, int);
and return the result as a number. */
CORE_ADDR
-parse_and_eval_address (char *exp)
+parse_and_eval_address (const char *exp)
{
struct expression *expr = parse_expression (exp);
CORE_ADDR addr;
/* Like parse_and_eval_address, but treats the value of the expression
as an integer, not an address, returns a LONGEST, not a CORE_ADDR. */
LONGEST
-parse_and_eval_long (char *exp)
+parse_and_eval_long (const char *exp)
{
struct expression *expr = parse_expression (exp);
LONGEST retval;
}
struct value *
-parse_and_eval (char *exp)
+parse_and_eval (const char *exp)
{
struct expression *expr = parse_expression (exp);
struct value *val;
EXPP is advanced to point to the comma. */
struct value *
-parse_to_comma_and_eval (char **expp)
+parse_to_comma_and_eval (const char **expp)
{
struct expression *expr = parse_exp_1 (expp, 0, (struct block *) 0, 1);
struct value *val;
in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does
not need them.
- If a memory error occurs while evaluating the expression, *RESULTP will
- be set to NULL. *RESULTP may be a lazy value, if the result could
- not be read from memory. It is used to determine whether a value
- is user-specified (we should watch the whole value) or intermediate
+ If PRESERVE_ERRORS is true, then exceptions are passed through.
+ Otherwise, if PRESERVE_ERRORS is false, then if a memory error
+ occurs while evaluating the expression, *RESULTP will be set to
+ NULL. *RESULTP may be a lazy value, if the result could not be
+ read from memory. It is used to determine whether a value is
+ user-specified (we should watch the whole value) or intermediate
(we should watch only the bit used to locate the final value).
If the final value, or any intermediate value, could not be read
void
fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
- struct value **resultp, struct value **val_chain)
+ struct value **resultp, struct value **val_chain,
+ int preserve_errors)
{
struct value *mark, *new_mark, *result;
volatile struct gdb_exception ex;
}
if (ex.reason < 0)
{
- /* Ignore memory errors, we want watchpoints pointing at
+ /* Ignore memory errors if we want watchpoints pointing at
inaccessible memory to still be created; otherwise, throw the
error to some higher catcher. */
switch (ex.error)
{
case MEMORY_ERROR:
- break;
+ if (!preserve_errors)
+ break;
default:
throw_exception (ex);
break;
return result;
}
-/* If the next expression is an OP_LABELED, skips past it,
- returning the label. Otherwise, does nothing and returns NULL. */
-
-static char *
-get_label (struct expression *exp, int *pos)
-{
- if (exp->elts[*pos].opcode == OP_LABELED)
- {
- int pc = (*pos)++;
- char *name = &exp->elts[pc + 2].string;
- int tem = longest_to_int (exp->elts[pc + 1].longconst);
-
- (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
- return name;
- }
- else
- return NULL;
-}
-
-/* This function evaluates tuples (in (the deleted) Chill) or
- brace-initializers (in C/C++) for structure types. */
+/* This function evaluates brace-initializers (in C/C++) for
+ structure types. */
static struct value *
evaluate_struct_tuple (struct value *struct_val,
int *pos, enum noside noside, int nargs)
{
struct type *struct_type = check_typedef (value_type (struct_val));
- struct type *substruct_type = struct_type;
struct type *field_type;
int fieldno = -1;
- int variantno = -1;
- int subfieldno = -1;
while (--nargs >= 0)
{
- int pc = *pos;
struct value *val = NULL;
- int nlabels = 0;
int bitpos, bitsize;
bfd_byte *addr;
- /* Skip past the labels, and count them. */
- while (get_label (exp, pos) != NULL)
- nlabels++;
-
- do
- {
- char *label = get_label (exp, &pc);
-
- if (label)
- {
- for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
- fieldno++)
- {
- const char *field_name =
- TYPE_FIELD_NAME (struct_type, fieldno);
-
- if (field_name != NULL && strcmp (field_name, label) == 0)
- {
- variantno = -1;
- subfieldno = fieldno;
- substruct_type = struct_type;
- goto found;
- }
- }
- for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
- fieldno++)
- {
- const char *field_name =
- TYPE_FIELD_NAME (struct_type, fieldno);
-
- field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
- if ((field_name == 0 || *field_name == '\0')
- && TYPE_CODE (field_type) == TYPE_CODE_UNION)
- {
- variantno = 0;
- for (; variantno < TYPE_NFIELDS (field_type);
- variantno++)
- {
- substruct_type
- = TYPE_FIELD_TYPE (field_type, variantno);
- if (TYPE_CODE (substruct_type) == TYPE_CODE_STRUCT)
- {
- for (subfieldno = 0;
- subfieldno < TYPE_NFIELDS (substruct_type);
- subfieldno++)
- {
- if (strcmp(TYPE_FIELD_NAME (substruct_type,
- subfieldno),
- label) == 0)
- {
- goto found;
- }
- }
- }
- }
- }
- }
- error (_("there is no field named %s"), label);
- found:
- ;
- }
- else
- {
- /* Unlabelled tuple element - go to next field. */
- if (variantno >= 0)
- {
- subfieldno++;
- if (subfieldno >= TYPE_NFIELDS (substruct_type))
- {
- variantno = -1;
- substruct_type = struct_type;
- }
- }
- if (variantno < 0)
- {
- fieldno++;
- /* Skip static fields. */
- while (fieldno < TYPE_NFIELDS (struct_type)
- && field_is_static (&TYPE_FIELD (struct_type,
- fieldno)))
- fieldno++;
- subfieldno = fieldno;
- if (fieldno >= TYPE_NFIELDS (struct_type))
- error (_("too many initializers"));
- field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
- if (TYPE_CODE (field_type) == TYPE_CODE_UNION
- && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
- error (_("don't know which variant you want to set"));
- }
- }
+ fieldno++;
+ /* Skip static fields. */
+ while (fieldno < TYPE_NFIELDS (struct_type)
+ && field_is_static (&TYPE_FIELD (struct_type,
+ fieldno)))
+ fieldno++;
+ if (fieldno >= TYPE_NFIELDS (struct_type))
+ error (_("too many initializers"));
+ field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
+ if (TYPE_CODE (field_type) == TYPE_CODE_UNION
+ && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
+ error (_("don't know which variant you want to set"));
+
+ /* Here, struct_type is the type of the inner struct,
+ while substruct_type is the type of the inner struct.
+ These are the same for normal structures, but a variant struct
+ contains anonymous union fields that contain substruct fields.
+ The value fieldno is the index of the top-level (normal or
+ anonymous union) field in struct_field, while the value
+ subfieldno is the index of the actual real (named inner) field
+ in substruct_type. */
+
+ field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
+ if (val == 0)
+ val = evaluate_subexp (field_type, exp, pos, noside);
+
+ /* Now actually set the field in struct_val. */
+
+ /* Assign val to field fieldno. */
+ if (value_type (val) != field_type)
+ val = value_cast (field_type, val);
+
+ bitsize = TYPE_FIELD_BITSIZE (struct_type, fieldno);
+ bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
+ addr = value_contents_writeable (struct_val) + bitpos / 8;
+ if (bitsize)
+ modify_field (struct_type, addr,
+ value_as_long (val), bitpos % 8, bitsize);
+ else
+ memcpy (addr, value_contents (val),
+ TYPE_LENGTH (value_type (val)));
- /* Here, struct_type is the type of the inner struct,
- while substruct_type is the type of the inner struct.
- These are the same for normal structures, but a variant struct
- contains anonymous union fields that contain substruct fields.
- The value fieldno is the index of the top-level (normal or
- anonymous union) field in struct_field, while the value
- subfieldno is the index of the actual real (named inner) field
- in substruct_type. */
-
- field_type = TYPE_FIELD_TYPE (substruct_type, subfieldno);
- if (val == 0)
- val = evaluate_subexp (field_type, exp, pos, noside);
-
- /* Now actually set the field in struct_val. */
-
- /* Assign val to field fieldno. */
- if (value_type (val) != field_type)
- val = value_cast (field_type, val);
-
- bitsize = TYPE_FIELD_BITSIZE (substruct_type, subfieldno);
- bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
- if (variantno >= 0)
- bitpos += TYPE_FIELD_BITPOS (substruct_type, subfieldno);
- addr = value_contents_writeable (struct_val) + bitpos / 8;
- if (bitsize)
- modify_field (struct_type, addr,
- value_as_long (val), bitpos % 8, bitsize);
- else
- memcpy (addr, value_contents (val),
- TYPE_LENGTH (value_type (val)));
- }
- while (--nlabels > 0);
}
return struct_val;
}
static struct type *
make_params (int num_types, struct type **param_types)
{
- struct type *type = XZALLOC (struct type);
- TYPE_MAIN_TYPE (type) = XZALLOC (struct main_type);
+ struct type *type = XCNEW (struct type);
+ TYPE_MAIN_TYPE (type) = XCNEW (struct main_type);
TYPE_LENGTH (type) = 1;
TYPE_CODE (type) = TYPE_CODE_METHOD;
TYPE_VPTR_FIELDNO (type) = -1;
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (SYMBOL_TYPE (sym), not_lval);
- if (SYMBOL_CLASS (sym) != LOC_COMPUTED
+ if (SYMBOL_COMPUTED_OPS (sym) == NULL
|| SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry == NULL)
error (_("Symbol \"%s\" does not have any specific entry value"),
SYMBOL_PRINT_NAME (sym));
alloca (sizeof (struct value *) * (nargs + 3));
if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
{
- nargs++;
/* First, evaluate the structure into arg2. */
pc2 = (*pos)++;
arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
- if (TYPE_CODE (check_typedef (value_type (arg1)))
- != TYPE_CODE_METHODPTR)
- error (_("Non-pointer-to-member value used in pointer-to-member "
- "construct"));
+ type = check_typedef (value_type (arg1));
+ if (TYPE_CODE (type) == TYPE_CODE_METHODPTR)
+ {
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ arg1 = value_zero (TYPE_TARGET_TYPE (type), not_lval);
+ else
+ arg1 = cplus_method_ptr_to_value (&arg2, arg1);
- if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ /* Now, say which argument to start evaluating from. */
+ nargs++;
+ tem = 2;
+ argvec[1] = arg2;
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_MEMBERPTR)
{
- struct type *method_type = check_typedef (value_type (arg1));
+ struct type *type_ptr
+ = lookup_pointer_type (TYPE_DOMAIN_TYPE (type));
+ struct type *target_type_ptr
+ = lookup_pointer_type (TYPE_TARGET_TYPE (type));
+
+ /* Now, convert these values to an address. */
+ arg2 = value_cast (type_ptr, arg2);
+
+ mem_offset = value_as_long (arg1);
- arg1 = value_zero (method_type, not_lval);
+ arg1 = value_from_pointer (target_type_ptr,
+ value_as_long (arg2) + mem_offset);
+ arg1 = value_ind (arg1);
+ tem = 1;
}
else
- arg1 = cplus_method_ptr_to_value (&arg2, arg1);
-
- /* Now, say which argument to start evaluating from. */
- tem = 2;
+ error (_("Non-pointer-to-member value used in pointer-to-member "
+ "construct"));
}
else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
{
find_overload_match (&argvec[1], nargs, func_name,
NON_METHOD, /* not method */
- 0, /* strict match */
NULL, NULL, /* pass NULL symbol since
symbol is unknown */
NULL, &symp, NULL, 0);
(void) find_overload_match (&argvec[1], nargs, tstr,
METHOD, /* method */
- 0, /* strict match */
&arg2, /* the object */
NULL, &valp, NULL,
&static_memfuncp, 0);
}
else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
{
- argvec[1] = arg2;
+ /* Pointer to member. argvec[1] is already set up. */
argvec[0] = arg1;
}
else if (op == OP_VAR_VALUE || (op == OP_SCOPE && function != NULL))
(void) find_overload_match (&argvec[1], nargs,
NULL, /* no need for name */
NON_METHOD, /* not method */
- 0, /* strict match */
NULL, function, /* the function */
NULL, &symp, NULL, no_adl);
arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
if (noside == EVAL_SKIP)
goto nosideret;
+ arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string,
+ NULL, "structure");
if (noside == EVAL_AVOID_SIDE_EFFECTS)
- return value_zero (lookup_struct_elt_type (value_type (arg1),
- &exp->elts[pc + 2].string,
- 0),
- lval_memory);
- else
- {
- struct value *temp = arg1;
-
- return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
- NULL, "structure");
- }
+ arg3 = value_zero (value_type (arg3), not_lval);
+ return arg3;
case STRUCTOP_PTR:
tem = longest_to_int (exp->elts[pc + 1].longconst);
}
}
+ arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string,
+ NULL, "structure pointer");
if (noside == EVAL_AVOID_SIDE_EFFECTS)
- return value_zero (lookup_struct_elt_type (value_type (arg1),
- &exp->elts[pc + 2].string,
- 0),
- lval_memory);
- else
- {
- struct value *temp = arg1;
-
- return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
- NULL, "structure pointer");
- }
+ arg3 = value_zero (value_type (arg3), not_lval);
+ return arg3;
case STRUCTOP_MEMBER:
case STRUCTOP_MPTR:
else
error (_("Attempt to use a type as an expression"));
+ case OP_TYPEID:
+ {
+ struct value *result;
+ enum exp_opcode sub_op = exp->elts[*pos].opcode;
+
+ if (sub_op == OP_TYPE || sub_op == OP_DECLTYPE || sub_op == OP_TYPEOF)
+ result = evaluate_subexp (NULL_TYPE, exp, pos,
+ EVAL_AVOID_SIDE_EFFECTS);
+ else
+ result = evaluate_subexp (NULL_TYPE, exp, pos, noside);
+
+ if (noside != EVAL_NORMAL)
+ return allocate_value (cplus_typeid_type (exp->gdbarch));
+
+ return cplus_typeid (result);
+ }
+
default:
/* Removing this case and compiling with gcc -Wall reveals that
a lot of cases are hitting this case. Some of these should
{
struct type *type = check_typedef (value_type (x));
- if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x))
- return value_zero (lookup_pointer_type (value_type (x)),
- not_lval);
- else if (TYPE_CODE (type) == TYPE_CODE_REF)
+ if (TYPE_CODE (type) == TYPE_CODE_REF)
return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
not_lval);
+ else if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x))
+ return value_zero (lookup_pointer_type (value_type (x)),
+ not_lval);
else
error (_("Attempt to take address of "
"value not located in memory."));