/* Evaluate expressions for GDB.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdb_string.h"
return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
}
+/* Evaluate a subexpression, avoiding all memory references and
+ getting a value whose type alone is correct. */
+
+struct value *
+evaluate_subexpression_type (struct expression *exp, int subexp)
+{
+ return evaluate_subexp (NULL_TYPE, exp, &subexp, EVAL_AVOID_SIDE_EFFECTS);
+}
+
+/* Extract a field operation from an expression. If the subexpression
+ of EXP starting at *SUBEXP is not a structure dereference
+ operation, return NULL. Otherwise, return the name of the
+ dereferenced field, and advance *SUBEXP to point to the
+ subexpression of the left-hand-side of the dereference. This is
+ used when completing field names. */
+
+char *
+extract_field_op (struct expression *exp, int *subexp)
+{
+ int tem;
+ char *result;
+ if (exp->elts[*subexp].opcode != STRUCTOP_STRUCT
+ && exp->elts[*subexp].opcode != STRUCTOP_PTR)
+ return NULL;
+ tem = longest_to_int (exp->elts[*subexp + 1].longconst);
+ result = &exp->elts[*subexp + 2].string;
+ (*subexp) += 1 + 3 + BYTES_TO_EXP_ELEM (tem + 1);
+ return result;
+}
+
/* If the next expression is an OP_LABELED, skips past it,
returning the label. Otherwise, does nothing and returns NULL. */
return value_from_double (exp->elts[pc + 1].type,
exp->elts[pc + 2].doubleconst);
+ case OP_DECFLOAT:
+ (*pos) += 3;
+ return value_from_decfloat (exp->elts[pc + 1].type,
+ exp->elts[pc + 2].decfloatconst);
+
case OP_VAR_VALUE:
(*pos) += 3;
if (noside == EVAL_SKIP)
case OP_REGISTER:
{
- int regno = longest_to_int (exp->elts[pc + 1].longconst);
+ const char *name = &exp->elts[pc + 2].string;
+ int regno;
struct value *val;
- (*pos) += 2;
- if (noside == EVAL_AVOID_SIDE_EFFECTS)
+
+ (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
+ regno = frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
+ name, strlen (name));
+ if (regno == -1)
+ error (_("Register $%s not available."), name);
+
+ /* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return
+ a value with the appropriate register type. Unfortunately,
+ we don't have easy access to the type of user registers.
+ So for these registers, we fetch the register value regardless
+ of the evaluation mode. */
+ if (noside == EVAL_AVOID_SIDE_EFFECTS
+ && regno < gdbarch_num_regs (current_gdbarch)
+ + gdbarch_num_pseudo_regs (current_gdbarch))
val = value_zero (register_type (current_gdbarch, regno), not_lval);
else
val = value_of_register (regno, get_selected_frame (NULL));
if (val == NULL)
- error (_("Value of register %s not available."),
- frame_map_regnum_to_name (get_selected_frame (NULL), regno));
+ error (_("Value of register %s not available."), name);
else
return val;
}
for (; range_low <= range_high; range_low++)
{
int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
- if (BITS_BIG_ENDIAN)
+ if (gdbarch_bits_big_endian (current_gdbarch))
bit_index = TARGET_CHAR_BIT - 1 - bit_index;
valaddr[(unsigned) range_low / TARGET_CHAR_BIT]
|= 1 << bit_index;
CORE_ADDR selector = 0;
- int using_gcc = 0;
int struct_return = 0;
int sub_no_side = 0;
{
struct block *b;
CORE_ADDR funaddr;
- struct type *value_type;
+ struct type *val_type;
- funaddr = find_function_addr (method, &value_type);
+ funaddr = find_function_addr (method, &val_type);
b = block_for_pc (funaddr);
- /* If compiled without -g, assume GCC 2. */
- using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
-
- CHECK_TYPEDEF (value_type);
+ CHECK_TYPEDEF (val_type);
- if ((value_type == NULL)
- || (TYPE_CODE(value_type) == TYPE_CODE_ERROR))
+ if ((val_type == NULL)
+ || (TYPE_CODE(val_type) == TYPE_CODE_ERROR))
{
if (expect_type != NULL)
- value_type = expect_type;
+ val_type = expect_type;
}
- struct_return = using_struct_return (value_type, using_gcc);
+ struct_return = using_struct_return (value_type (method), val_type);
}
else if (expect_type != NULL)
{
- struct_return = using_struct_return (check_typedef (expect_type), using_gcc);
+ struct_return = using_struct_return (NULL,
+ check_typedef (expect_type));
}
/* Found a function symbol. Now we will substitute its
argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 3));
if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
{
- /* 1997-08-01 Currently we do not support function invocation
- via pointers-to-methods with HP aCC. Pointer does not point
- to the function, but possibly to some thunk. */
- if (deprecated_hp_som_som_object_present)
- {
- error (_("Not implemented: function invocation through pointer to method with HP aCC"));
- }
-
nargs++;
/* First, evaluate the structure into arg2 */
pc2 = (*pos)++;
switch (TYPE_CODE (type))
{
case TYPE_CODE_METHODPTR:
- if (deprecated_hp_som_som_object_present)
- {
- /* With HP aCC, pointers to methods do not point to the
- function code. */
- /* 1997-08-19 */
- error (_("Pointers to methods not supported with HP aCC"));
- }
-
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (TYPE_TARGET_TYPE (type), not_lval);
else
arg1);
mem_offset = value_as_long (arg2);
- if (deprecated_hp_som_som_object_present)
- {
- /* HP aCC generates offsets that have bit #29 set; turn it off to get
- a real offset to the member. */
- if (!mem_offset) /* no bias -> really null */
- error (_("Attempted dereference of null pointer-to-member"));
- mem_offset &= ~0x20000000;
- }
arg3 = value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
value_as_long (arg1) + mem_offset);
arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
- /* Do special stuff for HP aCC pointers to members */
- if (deprecated_hp_som_som_object_present)
- {
- /* 1997-08-19 Can't assign HP aCC pointers to methods. No details of
- the implementation yet; but the pointer appears to point to a code
- sequence (thunk) in memory -- in any case it is *not* the address
- of the function as it would be in a naive implementation. */
- if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_METHODPTR)
- error (_("Assignment to pointers to methods not implemented with HP aCC"));
-
- /* HP aCC pointers to data members require a constant bias. */
- if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_MEMBERPTR)
- {
- unsigned int *ptr = (unsigned int *) value_contents (arg2); /* forces evaluation */
- *ptr |= 0x20000000; /* set 29th bit */
- }
- }
-
if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
return arg1;
if (binop_user_defined_p (op, arg1, arg2))
case BINOP_EXP:
case BINOP_MUL:
case BINOP_DIV:
+ case BINOP_INTDIV:
case BINOP_REM:
case BINOP_MOD:
case BINOP_LSH:
goto nosideret;
if (binop_user_defined_p (op, arg1, arg2))
return value_x_binop (arg1, arg2, op, OP_NULL, noside);
- else if (noside == EVAL_AVOID_SIDE_EFFECTS
- && (op == BINOP_DIV || op == BINOP_REM || op == BINOP_MOD))
- return value_zero (value_type (arg1), not_lval);
else
- return value_binop (arg1, arg2, op);
+ {
+ /* If EVAL_AVOID_SIDE_EFFECTS and we're dividing by zero,
+ fudge arg2 to avoid division-by-zero, the caller is
+ (theoretically) only looking for the type of the result. */
+ if (noside == EVAL_AVOID_SIDE_EFFECTS
+ /* ??? Do we really want to test for BINOP_MOD here?
+ The implementation of value_binop gives it a well-defined
+ value. */
+ && (op == BINOP_DIV
+ || op == BINOP_INTDIV
+ || op == BINOP_REM
+ || op == BINOP_MOD)
+ && value_logical_not (arg2))
+ {
+ struct value *v_one, *retval;
+
+ v_one = value_one (value_type (arg2), not_lval);
+ retval = value_binop (arg1, v_one, op);
+ return retval;
+ }
+ else
+ return value_binop (arg1, arg2, op);
+ }
case BINOP_RANGE:
arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
returns the correct type value */
deprecated_set_value_type (arg1, tmp_type);
- return value_ind (value_add (value_coerce_array (arg1), arg2));
+ return value_subscripted_rvalue (arg1, arg2, 0);
}
case BINOP_LOGICAL_AND:
else
{
struct value *retvalp = evaluate_subexp_for_address (exp, pos, noside);
- /* If HP aCC object, use bias for pointers to members */
- if (deprecated_hp_som_som_object_present
- && TYPE_CODE (value_type (retvalp)) == TYPE_CODE_MEMBERPTR)
- {
- unsigned int *ptr = (unsigned int *) value_contents (retvalp); /* forces evaluation */
- *ptr |= 0x20000000; /* set 29th bit */
- }
return retvalp;
}
if (sym_class == LOC_CONST
|| sym_class == LOC_CONST_BYTES
- || sym_class == LOC_REGISTER
- || sym_class == LOC_REGPARM)
+ || sym_class == LOC_REGISTER)
error (_("Attempt to take address of register or constant."));
return
value_zero (type, not_lval);
}
- else
+ else if (symbol_read_needs_frame (var))
return
locate_var_value
(var,
block_innermost_frame (exp->elts[pc + 1].block));
+ else
+ return locate_var_value (var, NULL);
case OP_SCOPE:
tem = longest_to_int (exp->elts[pc + 2].longconst);
{
struct type *type = check_typedef (value_type (x));
- if (VALUE_LVAL (x) == lval_memory)
+ 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)
return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
not_lval);
else
- error (_("Attempt to take address of non-lval"));
+ error (_("Attempt to take address of value not located in memory."));
}
return value_addr (x);
}
projects / deliverable / binutils-gdb.git / blobdiff