/* Evaluate expressions for GDB.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001
- Free Software Foundation, Inc.
+
+ Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+ 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "language.h" /* For CAST_IS_CONVERSION */
#include "f-lang.h" /* for array bound stuff */
#include "cp-abi.h"
+#include "infcall.h"
+#include "objc-lang.h"
+#include "block.h"
/* Defined in symtab.c */
extern int hp_som_som_object_present;
struct expression *expr = parse_expression (exp);
register CORE_ADDR addr;
register struct cleanup *old_chain =
- make_cleanup (free_current_contents, &expr);
+ make_cleanup (free_current_contents, &expr);
addr = value_as_address (evaluate_expression (expr));
do_cleanups (old_chain);
struct expression *expr = parse_exp_1 (expptr, (struct block *) 0, 0);
register CORE_ADDR addr;
register struct cleanup *old_chain =
- make_cleanup (free_current_contents, &expr);
+ make_cleanup (free_current_contents, &expr);
addr = value_as_address (evaluate_expression (expr));
do_cleanups (old_chain);
{
struct expression *expr = parse_expression (exp);
struct value *val;
- register struct cleanup *old_chain
- = make_cleanup (free_current_contents, &expr);
+ register struct cleanup *old_chain =
+ make_cleanup (free_current_contents, &expr);
val = evaluate_expression (expr);
do_cleanups (old_chain);
{
struct expression *expr = parse_exp_1 (expp, (struct block *) 0, 1);
struct value *val;
- register struct cleanup *old_chain
- = make_cleanup (free_current_contents, &expr);
+ register struct cleanup *old_chain =
+ make_cleanup (free_current_contents, &expr);
val = evaluate_expression (expr);
do_cleanups (old_chain);
return NULL;
}
-/* This function evaluates tuples (in Chill) or brace-initializers
- (in C/C++) for structure types. */
+/* This function evaluates tuples (in (the deleted) Chill) or
+ brace-initializers (in C/C++) for structure types. */
static struct value *
evaluate_struct_tuple (struct value *struct_val,
return struct_val;
}
-/* Recursive helper function for setting elements of array tuples for Chill.
- The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND);
- the element value is ELEMENT;
- EXP, POS and NOSIDE are as usual.
- Evaluates index expresions and sets the specified element(s) of
- ARRAY to ELEMENT.
- Returns last index value. */
+/* Recursive helper function for setting elements of array tuples for
+ (the deleted) Chill. The target is ARRAY (which has bounds
+ LOW_BOUND to HIGH_BOUND); the element value is ELEMENT; EXP, POS
+ and NOSIDE are as usual. Evaluates index expresions and sets the
+ specified element(s) of ARRAY to ELEMENT. Returns last index
+ value. */
static LONGEST
init_array_element (struct value *array, struct value *element,
case OP_REGISTER:
{
int regno = longest_to_int (exp->elts[pc + 1].longconst);
- struct value *val = value_of_register (regno);
-
+ struct value *val = value_of_register (regno, get_selected_frame ());
(*pos) += 2;
if (val == NULL)
- error ("Value of register %s not available.", REGISTER_NAME (regno));
+ error ("Value of register %s not available.",
+ frame_map_regnum_to_name (regno));
else
return val;
}
goto nosideret;
return value_string (&exp->elts[pc + 2].string, tem);
+ case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant. */
+ tem = longest_to_int (exp->elts[pc + 1].longconst);
+ (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
+ if (noside == EVAL_SKIP)
+ {
+ goto nosideret;
+ }
+ return (struct value *) value_nsstring (&exp->elts[pc + 2].string, tem + 1);
+
case OP_BITSTRING:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos)
return set;
}
- argvec = (value_ptr *) alloca (sizeof (value_ptr) * nargs);
+ argvec = (struct value **) alloca (sizeof (struct value *) * nargs);
for (tem = 0; tem < nargs; tem++)
{
/* Ensure that array expressions are coerced into pointer objects. */
return arg2;
}
+ case OP_OBJC_SELECTOR:
+ { /* Objective C @selector operator. */
+ char *sel = &exp->elts[pc + 2].string;
+ int len = longest_to_int (exp->elts[pc + 1].longconst);
+
+ (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
+ if (noside == EVAL_SKIP)
+ goto nosideret;
+
+ if (sel[len] != 0)
+ sel[len] = 0; /* Make sure it's terminated. */
+ return value_from_longest (lookup_pointer_type (builtin_type_void),
+ lookup_child_selector (sel));
+ }
+
+ case OP_OBJC_MSGCALL:
+ { /* Objective C message (method) call. */
+
+ static unsigned long responds_selector = 0;
+ static unsigned long method_selector = 0;
+
+ unsigned long selector = 0;
+
+ int using_gcc = 0;
+ int struct_return = 0;
+ int sub_no_side = 0;
+
+ static struct value *msg_send = NULL;
+ static struct value *msg_send_stret = NULL;
+ static int gnu_runtime = 0;
+
+ struct value *target = NULL;
+ struct value *method = NULL;
+ struct value *called_method = NULL;
+
+ struct type *selector_type = NULL;
+
+ struct value *ret = NULL;
+ CORE_ADDR addr = 0;
+
+ selector = exp->elts[pc + 1].longconst;
+ nargs = exp->elts[pc + 2].longconst;
+ argvec = (struct value **) alloca (sizeof (struct value *)
+ * (nargs + 5));
+
+ (*pos) += 3;
+
+ selector_type = lookup_pointer_type (builtin_type_void);
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ sub_no_side = EVAL_NORMAL;
+ else
+ sub_no_side = noside;
+
+ target = evaluate_subexp (selector_type, exp, pos, sub_no_side);
+
+ if (value_as_long (target) == 0)
+ return value_from_longest (builtin_type_long, 0);
+
+ if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0))
+ gnu_runtime = 1;
+
+ /* Find the method dispatch (Apple runtime) or method lookup
+ (GNU runtime) function for Objective-C. These will be used
+ to lookup the symbol information for the method. If we
+ can't find any symbol information, then we'll use these to
+ call the method, otherwise we can call the method
+ directly. The msg_send_stret function is used in the special
+ case of a method that returns a structure (Apple runtime
+ only). */
+ if (gnu_runtime)
+ {
+ msg_send = find_function_in_inferior ("objc_msg_lookup");
+ msg_send_stret = find_function_in_inferior ("objc_msg_lookup");
+ }
+ else
+ {
+ msg_send = find_function_in_inferior ("objc_msgSend");
+ /* Special dispatcher for methods returning structs */
+ msg_send_stret = find_function_in_inferior ("objc_msgSend_stret");
+ }
+
+ /* Verify the target object responds to this method. The
+ standard top-level 'Object' class uses a different name for
+ the verification method than the non-standard, but more
+ often used, 'NSObject' class. Make sure we check for both. */
+
+ responds_selector = lookup_child_selector ("respondsToSelector:");
+ if (responds_selector == 0)
+ responds_selector = lookup_child_selector ("respondsTo:");
+
+ if (responds_selector == 0)
+ error ("no 'respondsTo:' or 'respondsToSelector:' method");
+
+ method_selector = lookup_child_selector ("methodForSelector:");
+ if (method_selector == 0)
+ method_selector = lookup_child_selector ("methodFor:");
+
+ if (method_selector == 0)
+ error ("no 'methodFor:' or 'methodForSelector:' method");
+
+ /* Call the verification method, to make sure that the target
+ class implements the desired method. */
+
+ argvec[0] = msg_send;
+ argvec[1] = target;
+ argvec[2] = value_from_longest (builtin_type_long, responds_selector);
+ argvec[3] = value_from_longest (builtin_type_long, selector);
+ argvec[4] = 0;
+
+ ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ if (gnu_runtime)
+ {
+ /* Function objc_msg_lookup returns a pointer. */
+ argvec[0] = ret;
+ ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ }
+ if (value_as_long (ret) == 0)
+ error ("Target does not respond to this message selector.");
+
+ /* Call "methodForSelector:" method, to get the address of a
+ function method that implements this selector for this
+ class. If we can find a symbol at that address, then we
+ know the return type, parameter types etc. (that's a good
+ thing). */
+
+ argvec[0] = msg_send;
+ argvec[1] = target;
+ argvec[2] = value_from_longest (builtin_type_long, method_selector);
+ argvec[3] = value_from_longest (builtin_type_long, selector);
+ argvec[4] = 0;
+
+ ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ if (gnu_runtime)
+ {
+ argvec[0] = ret;
+ ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ }
+
+ /* ret should now be the selector. */
+
+ addr = value_as_long (ret);
+ if (addr)
+ {
+ struct symbol *sym = NULL;
+ /* Is it a high_level symbol? */
+
+ sym = find_pc_function (addr);
+ if (sym != NULL)
+ method = value_of_variable (sym, 0);
+ }
+
+ /* If we found a method with symbol information, check to see
+ if it returns a struct. Otherwise assume it doesn't. */
+
+ if (method)
+ {
+ struct block *b;
+ CORE_ADDR funaddr;
+ struct type *value_type;
+
+ funaddr = find_function_addr (method, &value_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);
+
+ if ((value_type == NULL)
+ || (TYPE_CODE(value_type) == TYPE_CODE_ERROR))
+ {
+ if (expect_type != NULL)
+ value_type = expect_type;
+ }
+
+ struct_return = using_struct_return (method, funaddr, value_type, using_gcc);
+ }
+ else if (expect_type != NULL)
+ {
+ struct_return = using_struct_return (NULL, addr, check_typedef (expect_type), using_gcc);
+ }
+
+ /* Found a function symbol. Now we will substitute its
+ value in place of the message dispatcher (obj_msgSend),
+ so that we call the method directly instead of thru
+ the dispatcher. The main reason for doing this is that
+ we can now evaluate the return value and parameter values
+ according to their known data types, in case we need to
+ do things like promotion, dereferencing, special handling
+ of structs and doubles, etc.
+
+ We want to use the type signature of 'method', but still
+ jump to objc_msgSend() or objc_msgSend_stret() to better
+ mimic the behavior of the runtime. */
+
+ if (method)
+ {
+ if (TYPE_CODE (VALUE_TYPE (method)) != TYPE_CODE_FUNC)
+ error ("method address has symbol information with non-function type; skipping");
+ if (struct_return)
+ VALUE_ADDRESS (method) = value_as_address (msg_send_stret);
+ else
+ VALUE_ADDRESS (method) = value_as_address (msg_send);
+ called_method = method;
+ }
+ else
+ {
+ if (struct_return)
+ called_method = msg_send_stret;
+ else
+ called_method = msg_send;
+ }
+
+ if (noside == EVAL_SKIP)
+ goto nosideret;
+
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ {
+ /* If the return type doesn't look like a function type,
+ call an error. This can happen if somebody tries to
+ turn a variable into a function call. This is here
+ because people often want to call, eg, strcmp, which
+ gdb doesn't know is a function. If gdb isn't asked for
+ it's opinion (ie. through "whatis"), it won't offer
+ it. */
+
+ struct type *type = VALUE_TYPE (called_method);
+ if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
+ type = TYPE_TARGET_TYPE (type);
+ type = TYPE_TARGET_TYPE (type);
+
+ if (type)
+ {
+ if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type)
+ return allocate_value (expect_type);
+ else
+ return allocate_value (type);
+ }
+ else
+ error ("Expression of type other than \"method returning ...\" used as a method");
+ }
+
+ /* Now depending on whether we found a symbol for the method,
+ we will either call the runtime dispatcher or the method
+ directly. */
+
+ argvec[0] = called_method;
+ argvec[1] = target;
+ argvec[2] = value_from_longest (builtin_type_long, selector);
+ /* User-supplied arguments. */
+ for (tem = 0; tem < nargs; tem++)
+ argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside);
+ argvec[tem + 3] = 0;
+
+ if (gnu_runtime && (method != NULL))
+ {
+ ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
+ /* Function objc_msg_lookup returns a pointer. */
+ argvec[0] = ret;
+ ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
+ }
+ else
+ ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
+
+ return ret;
+ }
+ break;
+
case OP_FUNCALL:
(*pos) += 2;
op = exp->elts[*pos].opcode;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
/* Allocate arg vector, including space for the function to be
called in argvec[0] and a terminating NULL */
- argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 3));
+ argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 3));
if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
{
LONGEST fnptr;
if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
{
int static_memfuncp;
- struct value *temp = arg2;
char tstr[256];
/* Method invocation : stuff "this" as first parameter */
- /* pai: this used to have lookup_pointer_type for some reason,
- * but temp is already a pointer to the object */
- argvec[1]
- = value_from_pointer (VALUE_TYPE (temp),
- VALUE_ADDRESS (temp) + VALUE_OFFSET (temp));
+ argvec[1] = arg2;
/* Name of method from expression */
strcpy (tstr, &exp->elts[pc2 + 2].string);
struct value *valp = NULL;
/* Prepare list of argument types for overload resolution */
- arg_types = (struct type **) xmalloc (nargs * (sizeof (struct type *)));
+ arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
for (ix = 1; ix <= nargs; ix++)
arg_types[ix - 1] = VALUE_TYPE (argvec[ix]);
(void) find_overload_match (arg_types, nargs, tstr,
1 /* method */ , 0 /* strict match */ ,
- arg2 /* the object */ , NULL,
+ &arg2 /* the object */ , NULL,
&valp, NULL, &static_memfuncp);
else
/* Non-C++ case -- or no overload resolution */
{
- temp = arg2;
+ struct value *temp = arg2;
argvec[0] = value_struct_elt (&temp, argvec + 1, tstr,
&static_memfuncp,
op == STRUCTOP_STRUCT
? "structure" : "structure pointer");
+ /* value_struct_elt updates temp with the correct value
+ of the ``this'' pointer if necessary, so modify argvec[1] to
+ reflect any ``this'' changes. */
+ arg2 = value_from_longest (lookup_pointer_type(VALUE_TYPE (temp)),
+ VALUE_ADDRESS (temp) + VALUE_OFFSET (temp)
+ + VALUE_EMBEDDED_OFFSET (temp));
argvec[1] = arg2; /* the ``this'' pointer */
}
struct symbol *symp;
/* Prepare list of argument types for overload resolution */
- arg_types = (struct type **) xmalloc (nargs * (sizeof (struct type *)));
+ arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
for (ix = 1; ix <= nargs; ix++)
arg_types[ix - 1] = VALUE_TYPE (argvec[ix]);
if (noside == EVAL_SKIP)
goto nosideret;
+ if (argvec[0] == NULL)
+ error ("Cannot evaluate function -- may be inlined");
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
/* If the return type doesn't look like a function type, call an
else
error ("Expression of type other than \"Function returning ...\" used as function");
}
- if (argvec[0] == NULL)
- error ("Cannot evaluate function -- may be inlined");
return call_function_by_hand (argvec[0], nargs, argvec + 1);
/* pai: FIXME save value from call_function_by_hand, then adjust pc by adjust_fn_pc if +ve */
/* It's a function call. */
/* Allocate arg vector, including space for the function to be
called in argvec[0] and a terminating NULL */
- argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 2));
+ argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 2));
argvec[0] = arg1;
tem = 1;
for (; tem <= nargs; tem++)
(*pos) += 1;
return value_of_this (1);
+ case OP_OBJC_SELF:
+ (*pos) += 1;
+ return value_of_local ("self", 1);
+
case OP_TYPE:
error ("Attempt to use a type name as an expression");
projects / binutils-gdb.git / blobdiff