/* Evaluate expressions for GDB.
- Copyright (C) 1986-2017 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "typeprint.h"
#include <ctype.h>
-/* This is defined in valops.c */
-extern int overload_resolution;
-
/* Prototypes for local functions. */
static struct value *evaluate_subexp_for_sizeof (struct expression *, int *,
evaluate_subexp (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
{
- struct cleanup *cleanups;
struct value *retval;
- int cleanup_temps = 0;
+ gdb::optional<enable_thread_stack_temporaries> stack_temporaries;
if (*pos == 0 && target_has_execution
&& exp->language_defn->la_language == language_cplus
- && !thread_stack_temporaries_enabled_p (inferior_ptid))
- {
- cleanups = enable_thread_stack_temporaries (inferior_ptid);
- cleanup_temps = 1;
- }
+ && !thread_stack_temporaries_enabled_p (inferior_thread ()))
+ stack_temporaries.emplace (inferior_thread ());
retval = (*exp->language_defn->la_exp_desc->evaluate_exp)
(expect_type, exp, pos, noside);
- if (cleanup_temps)
- {
- if (value_in_thread_stack_temporaries (retval, inferior_ptid))
- retval = value_non_lval (retval);
- do_cleanups (cleanups);
- }
+ if (stack_temporaries.has_value ()
+ && value_in_thread_stack_temporaries (retval, inferior_thread ()))
+ retval = value_non_lval (retval);
return retval;
}
struct value *
parse_to_comma_and_eval (const char **expp)
{
- expression_up expr = parse_exp_1 (expp, 0, (struct block *) 0, 1);
+ expression_up expr = parse_exp_1 (expp, 0, nullptr, 1);
return evaluate_expression (expr.get ());
}
set to any referenced values. *VALP will never be a lazy value.
This is the value which we store in struct breakpoint.
- If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the
- value chain. The caller must free the values individually. If
- VAL_CHAIN is NULL, all generated values will be left on the value
- chain. */
+ If VAL_CHAIN is non-NULL, the values put into *VAL_CHAIN will be
+ released from the value chain. If VAL_CHAIN is NULL, all generated
+ values will be left on the value chain. */
void
fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
- struct value **resultp, struct value **val_chain,
+ struct value **resultp,
+ std::vector<value_ref_ptr> *val_chain,
int preserve_errors)
{
struct value *mark, *new_mark, *result;
if (resultp)
*resultp = NULL;
if (val_chain)
- *val_chain = NULL;
+ val_chain->clear ();
/* Evaluate the expression. */
mark = value_mark ();
result = NULL;
- TRY
+ try
{
result = evaluate_subexp (NULL_TYPE, exp, pc, EVAL_NORMAL);
}
- CATCH (ex, RETURN_MASK_ALL)
+ catch (const gdb_exception &ex)
{
/* Ignore memory errors if we want watchpoints pointing at
inaccessible memory to still be created; otherwise, throw the
case MEMORY_ERROR:
if (!preserve_errors)
break;
+ /* Fall through. */
default:
- throw_exception (ex);
+ throw;
break;
}
}
- END_CATCH
new_mark = value_mark ();
if (mark == new_mark)
else
{
- TRY
+ try
{
value_fetch_lazy (result);
*valp = result;
}
- CATCH (except, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &except)
{
}
- END_CATCH
}
}
{
/* Return the chain of intermediate values. We use this to
decide which addresses to watch. */
- *val_chain = new_mark;
- value_release_to_mark (mark);
+ *val_chain = value_release_to_mark (mark);
}
}
subexpression of the left-hand-side of the dereference. This is
used when completing field names. */
-char *
+const char *
extract_field_op (struct expression *exp, int *subexp)
{
int tem;
}
}
-/* Constructs a fake method with the given parameter types. This
- function is used by the parser to construct an "expected" type for
+/* Represents a fake method with the given parameter types. This is
+ used by the parser to construct a temporary "expected" type for
method overload resolution. FLAGS is used as instance flags of the
new type, in order to be able to make the new type represent a
const/volatile overload. */
-static struct type *
-make_params (type_instance_flags flags,
- int num_types, struct type **param_types)
+class fake_method
+{
+public:
+ fake_method (type_instance_flags flags,
+ int num_types, struct type **param_types);
+ ~fake_method ();
+
+ /* The constructed type. */
+ struct type *type () { return &m_type; }
+
+private:
+ struct type m_type {};
+ main_type m_main_type {};
+};
+
+fake_method::fake_method (type_instance_flags flags,
+ int num_types, struct type **param_types)
{
- struct type *type = XCNEW (struct type);
- TYPE_MAIN_TYPE (type) = XCNEW (struct main_type);
+ struct type *type = &m_type;
+
+ TYPE_MAIN_TYPE (type) = &m_main_type;
TYPE_LENGTH (type) = 1;
TYPE_CODE (type) = TYPE_CODE_METHOD;
TYPE_CHAIN (type) = type;
}
}
+ /* We don't use TYPE_ZALLOC here to allocate space as TYPE is owned by
+ neither an objfile nor a gdbarch. As a result we must manually
+ allocate memory for auxiliary fields, and free the memory ourselves
+ when we are done with it. */
TYPE_NFIELDS (type) = num_types;
TYPE_FIELDS (type) = (struct field *)
- TYPE_ZALLOC (type, sizeof (struct field) * num_types);
+ xzalloc (sizeof (struct field) * num_types);
while (num_types-- > 0)
TYPE_FIELD_TYPE (type, num_types) = param_types[num_types];
+}
- return type;
+fake_method::~fake_method ()
+{
+ xfree (TYPE_FIELDS (&m_type));
}
/* Helper for evaluating an OP_VAR_VALUE. */
-static value *
+value *
evaluate_var_value (enum noside noside, const block *blk, symbol *var)
{
/* JYG: We used to just return value_zero of the symbol type if
struct value *ret = NULL;
- TRY
+ try
{
ret = value_of_variable (var, blk);
}
- CATCH (except, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &except)
{
if (noside != EVAL_AVOID_SIDE_EFFECTS)
- throw_exception (except);
+ throw;
ret = value_zero (SYMBOL_TYPE (var), not_lval);
}
- END_CATCH
return ret;
}
/* Helper for evaluating an OP_VAR_MSYM_VALUE. */
-static value *
+value *
evaluate_var_msym_value (enum noside noside,
struct objfile *objfile, minimal_symbol *msymbol)
{
- if (noside == EVAL_AVOID_SIDE_EFFECTS)
- {
- type *the_type = find_minsym_type_and_address (msymbol, objfile, NULL);
- return value_zero (the_type, not_lval);
- }
+ CORE_ADDR address;
+ type *the_type = find_minsym_type_and_address (msymbol, objfile, &address);
+
+ if (noside == EVAL_AVOID_SIDE_EFFECTS && !TYPE_GNU_IFUNC (the_type))
+ return value_zero (the_type, not_lval);
else
- {
- CORE_ADDR address;
- type *the_type = find_minsym_type_and_address (msymbol, objfile, &address);
- return value_at_lazy (the_type, address);
- }
+ return value_at_lazy (the_type, address);
}
/* Helper for returning a value when handling EVAL_SKIP. */
-static value *
+value *
eval_skip_value (expression *exp)
{
return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
else if (TYPE_CODE (ftype) == TYPE_CODE_XMETHOD)
{
type *return_type
- = result_type_of_xmethod (argvec[0], nargs, argvec + 1);
+ = result_type_of_xmethod (argvec[0],
+ gdb::make_array_view (argvec + 1,
+ nargs));
if (return_type == NULL)
error (_("Xmethod is missing return type."));
else if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
{
+ if (TYPE_GNU_IFUNC (ftype))
+ {
+ CORE_ADDR address = value_address (argvec[0]);
+ type *resolved_type = find_gnu_ifunc_target_type (address);
+
+ if (resolved_type != NULL)
+ ftype = resolved_type;
+ }
+
type *return_type = TYPE_TARGET_TYPE (ftype);
if (return_type == NULL)
return call_internal_function (exp->gdbarch, exp->language_defn,
argvec[0], nargs, argvec + 1);
case TYPE_CODE_XMETHOD:
- return call_xmethod (argvec[0], nargs, argvec + 1);
+ return call_xmethod (argvec[0], gdb::make_array_view (argvec + 1, nargs));
default:
return call_function_by_hand (argvec[0], default_return_type,
- nargs, argvec + 1);
+ gdb::make_array_view (argvec + 1, nargs));
}
}
while (unop_user_defined_p (op, arg2))
{
struct value *value = NULL;
- TRY
+ try
{
value = value_x_unop (arg2, op, noside);
}
- CATCH (except, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &except)
{
if (except.error == NOT_FOUND_ERROR)
break;
else
- throw_exception (except);
+ throw;
}
- END_CATCH
arg2 = value;
}
function_name = NULL;
if (TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
{
- function = cp_lookup_symbol_namespace (TYPE_TAG_NAME (type),
+ function = cp_lookup_symbol_namespace (TYPE_NAME (type),
name,
get_selected_block (0),
VAR_DOMAIN).symbol;
if (function == NULL)
error (_("No symbol \"%s\" in namespace \"%s\"."),
- name, TYPE_TAG_NAME (type));
+ name, TYPE_NAME (type));
tem = 1;
/* arg2 is left as NULL on purpose. */
{
if (op == OP_VAR_MSYM_VALUE)
{
- symbol *sym = exp->elts[*pos + 2].symbol;
- var_func_name = SYMBOL_PRINT_NAME (sym);
+ minimal_symbol *msym = exp->elts[*pos + 2].msymbol;
+ var_func_name = MSYMBOL_PRINT_NAME (msym);
}
else if (op == OP_VAR_VALUE)
{
- minimal_symbol *msym = exp->elts[*pos + 2].msymbol;
- var_func_name = MSYMBOL_PRINT_NAME (msym);
+ symbol *sym = exp->elts[*pos + 2].symbol;
+ var_func_name = SYMBOL_PRINT_NAME (sym);
}
argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
func_name = (char *) alloca (name_len + 1);
strcpy (func_name, &exp->elts[string_pc + 1].string);
- find_overload_match (&argvec[1], nargs, func_name,
+ find_overload_match (gdb::make_array_view (&argvec[1], nargs),
+ func_name,
NON_METHOD, /* not method */
NULL, NULL, /* pass NULL symbol since
symbol is unknown */
evaluation. */
struct value *valp = NULL;
- (void) find_overload_match (&argvec[1], nargs, tstr,
+ (void) find_overload_match (gdb::make_array_view (&argvec[1], nargs),
+ tstr,
METHOD, /* method */
&arg2, /* the object */
NULL, &valp, NULL,
if (op == OP_VAR_VALUE)
function = exp->elts[save_pos1+2].symbol;
- (void) find_overload_match (&argvec[1], nargs,
+ (void) find_overload_match (gdb::make_array_view (&argvec[1], nargs),
NULL, /* no need for name */
NON_METHOD, /* not method */
NULL, function, /* the function */
return eval_call (exp, noside, nargs, argvec, var_func_name, expect_type);
}
+/* Helper for skipping all the arguments in an undetermined argument list.
+ This function was designed for use in the OP_F77_UNDETERMINED_ARGLIST
+ case of evaluate_subexp_standard as multiple, but not all, code paths
+ require a generic skip. */
+
+static void
+skip_undetermined_arglist (int nargs, struct expression *exp, int *pos,
+ enum noside noside)
+{
+ for (int i = 0; i < nargs; ++i)
+ evaluate_subexp (NULL_TYPE, exp, pos, noside);
+}
+
struct value *
evaluate_subexp_standard (struct type *expect_type,
struct expression *exp, int *pos,
return value_from_longest (exp->elts[pc + 1].type,
exp->elts[pc + 2].longconst);
- case OP_DOUBLE:
- (*pos) += 3;
- return value_from_double (exp->elts[pc + 1].type,
- exp->elts[pc + 2].doubleconst);
-
- case OP_DECFLOAT:
+ case OP_FLOAT:
(*pos) += 3;
- return value_from_decfloat (exp->elts[pc + 1].type,
- exp->elts[pc + 2].decfloatconst);
+ return value_from_contents (exp->elts[pc + 1].type,
+ exp->elts[pc + 2].floatconst);
case OP_ADL_FUNC:
case OP_VAR_VALUE:
- (*pos) += 3;
- if (noside == EVAL_SKIP)
- return eval_skip_value (exp);
-
{
+ (*pos) += 3;
symbol *var = exp->elts[pc + 2].symbol;
if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_ERROR)
error_unknown_type (SYMBOL_PRINT_NAME (var));
-
- return evaluate_var_value (noside, exp->elts[pc + 1].block, var);
+ if (noside != EVAL_SKIP)
+ return evaluate_var_value (noside, exp->elts[pc + 1].block, var);
+ else
+ {
+ /* Return a dummy value of the correct type when skipping, so
+ that parent functions know what is to be skipped. */
+ return allocate_value (SYMBOL_TYPE (var));
+ }
}
case OP_VAR_MSYM_VALUE:
So for these registers, we fetch the register value regardless
of the evaluation mode. */
if (noside == EVAL_AVOID_SIDE_EFFECTS
- && regno < gdbarch_num_regs (exp->gdbarch)
- + gdbarch_num_pseudo_regs (exp->gdbarch))
+ && regno < gdbarch_num_cooked_regs (exp->gdbarch))
val = value_zero (register_type (exp->gdbarch, regno), not_lval);
else
val = value_of_register (regno, get_selected_frame (NULL));
only). */
if (gnu_runtime)
{
- struct type *type = selector_type;
+ type = selector_type;
type = lookup_function_type (type);
type = lookup_pointer_type (type);
argvec[3] = value_from_longest (long_type, selector);
argvec[4] = 0;
- ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, {argvec + 1, 3});
if (gnu_runtime)
{
/* Function objc_msg_lookup returns a pointer. */
argvec[0] = ret;
- ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, {argvec + 1, 3});
}
if (value_as_long (ret) == 0)
error (_("Target does not respond to this message selector."));
argvec[3] = value_from_longest (long_type, selector);
argvec[4] = 0;
- ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, {argvec + 1, 3});
if (gnu_runtime)
{
argvec[0] = ret;
- ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, {argvec + 1, 3});
}
/* ret should now be the selector. */
/* The address might point to a function descriptor;
resolve it to the actual code address instead. */
addr = gdbarch_convert_from_func_ptr_addr (exp->gdbarch, addr,
- ¤t_target);
+ current_top_target ());
/* Is it a high_level symbol? */
sym = find_pc_function (addr);
it's opinion (ie. through "whatis"), it won't offer
it. */
- struct type *type = value_type (called_method);
+ struct type *callee_type = value_type (called_method);
- if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
- type = TYPE_TARGET_TYPE (type);
- type = TYPE_TARGET_TYPE (type);
+ if (callee_type && TYPE_CODE (callee_type) == TYPE_CODE_PTR)
+ callee_type = TYPE_TARGET_TYPE (callee_type);
+ callee_type = TYPE_TARGET_TYPE (callee_type);
- if (type)
+ if (callee_type)
{
- if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type)
+ if ((TYPE_CODE (callee_type) == TYPE_CODE_ERROR) && expect_type)
return allocate_value (expect_type);
else
- return allocate_value (type);
+ return allocate_value (callee_type);
}
else
error (_("Expression of type other than "
argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside);
argvec[tem + 3] = 0;
+ auto call_args = gdb::make_array_view (argvec + 1, nargs + 2);
+
if (gnu_runtime && (method != NULL))
{
/* Function objc_msg_lookup returns a pointer. */
deprecated_set_value_type (argvec[0],
lookup_pointer_type (lookup_function_type (value_type (argvec[0]))));
- argvec[0]
- = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1);
+ argvec[0] = call_function_by_hand (argvec[0], NULL, call_args);
}
- ret = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1);
- return ret;
+ return call_function_by_hand (argvec[0], NULL, call_args);
}
break;
if (exp->elts[*pos].opcode == OP_RANGE)
return value_f90_subarray (arg1, exp, pos, noside);
else
- goto multi_f77_subscript;
+ {
+ if (noside == EVAL_SKIP)
+ {
+ skip_undetermined_arglist (nargs, exp, pos, noside);
+ /* Return the dummy value with the correct type. */
+ return arg1;
+ }
+ goto multi_f77_subscript;
+ }
case TYPE_CODE_STRING:
if (exp->elts[*pos].opcode == OP_RANGE)
return value_f90_subarray (arg1, exp, pos, noside);
else
{
+ if (noside == EVAL_SKIP)
+ {
+ skip_undetermined_arglist (nargs, exp, pos, noside);
+ /* Return the dummy value with the correct type. */
+ return arg1;
+ }
arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
return value_subscript (arg1, value_as_long (arg2));
}
case TYPE_CODE_PTR:
case TYPE_CODE_FUNC:
+ case TYPE_CODE_INTERNAL_FUNCTION:
/* It's a function call. */
/* Allocate arg vector, including space for the function to be
called in argvec[0] and a terminating NULL. */
argvec[0] = arg1;
tem = 1;
for (; tem <= nargs; tem++)
- argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
+ {
+ argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
+ /* Arguments in Fortran are passed by address. Coerce the
+ arguments here rather than in value_arg_coerce as otherwise
+ the call to malloc to place the non-lvalue parameters in
+ target memory is hit by this Fortran specific logic. This
+ results in malloc being called with a pointer to an integer
+ followed by an attempt to malloc the arguments to malloc in
+ target memory. Infinite recursion ensues. */
+ if (code == TYPE_CODE_PTR || code == TYPE_CODE_FUNC)
+ {
+ bool is_artificial
+ = TYPE_FIELD_ARTIFICIAL (value_type (arg1), tem - 1);
+ argvec[tem] = fortran_argument_convert (argvec[tem],
+ is_artificial);
+ }
+ }
argvec[tem] = 0; /* signal end of arglist */
if (noside == EVAL_SKIP)
return eval_skip_value (exp);
while (unop_user_defined_p (op, arg1))
{
struct value *value = NULL;
- TRY
+ try
{
value = value_x_unop (arg1, op, noside);
}
- CATCH (except, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &except)
{
if (except.error == NOT_FOUND_ERROR)
break;
else
- throw_exception (except);
+ throw;
}
- END_CATCH
arg1 = value;
}
with rtti type in order to continue on with successful
lookup of member / method only available in the rtti type. */
{
- struct type *type = value_type (arg1);
+ struct type *arg_type = value_type (arg1);
struct type *real_type;
int full, using_enc;
LONGEST top;
struct value_print_options opts;
get_user_print_options (&opts);
- if (opts.objectprint && TYPE_TARGET_TYPE(type)
- && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT))
+ if (opts.objectprint && TYPE_TARGET_TYPE (arg_type)
+ && (TYPE_CODE (TYPE_TARGET_TYPE (arg_type)) == TYPE_CODE_STRUCT))
{
real_type = value_rtti_indirect_type (arg1, &full, &top,
&using_enc);
for (ix = 0; ix < nargs; ++ix)
arg_types[ix] = exp->elts[pc + 2 + ix + 1].type;
- expect_type = make_params (flags, nargs, arg_types);
+ fake_method fake_expect_type (flags, nargs, arg_types);
*(pos) += 4 + nargs;
- arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside);
- xfree (TYPE_FIELDS (expect_type));
- xfree (TYPE_MAIN_TYPE (expect_type));
- xfree (expect_type);
- return arg1;
+ return evaluate_subexp_standard (fake_expect_type.type (), exp, pos,
+ noside);
}
case BINOP_CONCAT:
}
return evaluate_subexp_for_sizeof (exp, pos, noside);
+ case UNOP_ALIGNOF:
+ {
+ type = value_type (evaluate_subexp (NULL_TYPE, exp, pos,
+ EVAL_AVOID_SIDE_EFFECTS));
+ /* FIXME: This should be size_t. */
+ struct type *size_type = builtin_type (exp->gdbarch)->builtin_int;
+ ULONGEST align = type_align (type);
+ if (align == 0)
+ error (_("could not determine alignment of type"));
+ return value_from_longest (size_type, align);
+ }
+
case UNOP_CAST:
(*pos) += 2;
type = exp->elts[pc + 1].type;
|| sub_op == STRUCTOP_PTR
|| sub_op == OP_SCOPE))
{
- struct type *type = value_type (result);
+ type = value_type (result);
if (!TYPE_IS_REFERENCE (type))
{
{
val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL);
type = value_type (val);
+ if (TYPE_CODE (type) == TYPE_CODE_ARRAY
+ && is_dynamic_type (TYPE_INDEX_TYPE (type))
+ && TYPE_HIGH_BOUND_UNDEFINED (TYPE_INDEX_TYPE (type)))
+ return allocate_optimized_out_value (size_type);
}
else
(*pos) += 4;
(*pos) += 4;
minimal_symbol *msymbol = exp->elts[pc + 2].msymbol;
- value *val = evaluate_var_msym_value (noside,
- exp->elts[pc + 1].objfile,
- msymbol);
+ value *mval = evaluate_var_msym_value (noside,
+ exp->elts[pc + 1].objfile,
+ msymbol);
- type = value_type (val);
+ type = value_type (mval);
if (TYPE_CODE (type) == TYPE_CODE_ERROR)
error_unknown_type (MSYMBOL_PRINT_NAME (msymbol));
case BINOP_SUBSCRIPT:
if (noside == EVAL_NORMAL)
{
- int pc = (*pos) + 1;
+ int npc = (*pos) + 1;
- val = evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
+ val = evaluate_subexp (NULL_TYPE, exp, &npc, EVAL_AVOID_SIDE_EFFECTS);
type = check_typedef (value_type (val));
if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{