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- /* Perform non-arithmetic operations on values, for GDB.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994
- 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
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "symtab.h"
- #include "gdbtypes.h"
- #include "value.h"
- #include "frame.h"
- #include "inferior.h"
- #include "gdbcore.h"
- #include "target.h"
- #include "demangle.h"
- #include "language.h"
-
- #include <errno.h>
- #include <string.h>
-
- /* Local functions. */
-
- static int typecmp PARAMS ((int staticp, struct type *t1[], value_ptr t2[]));
-
- static CORE_ADDR find_function_addr PARAMS ((value_ptr, struct type **));
-
- static CORE_ADDR value_push PARAMS ((CORE_ADDR, value_ptr));
-
- static CORE_ADDR value_arg_push PARAMS ((CORE_ADDR, value_ptr));
-
- static value_ptr search_struct_field PARAMS ((char *, value_ptr, int,
- struct type *, int));
-
- static value_ptr search_struct_method PARAMS ((char *, value_ptr *,
- value_ptr *,
- int, int *, struct type *));
-
- static int check_field_in PARAMS ((struct type *, const char *));
-
- static CORE_ADDR allocate_space_in_inferior PARAMS ((int));
-
- static value_ptr cast_into_complex PARAMS ((struct type *, value_ptr));
-
- #define VALUE_SUBSTRING_START(VAL) VALUE_FRAME(VAL)
-
-
- /* Allocate NBYTES of space in the inferior using the inferior's malloc
- and return a value that is a pointer to the allocated space. */
-
- static CORE_ADDR
- allocate_space_in_inferior (len)
- int len;
- {
- register value_ptr val;
- register struct symbol *sym;
- struct minimal_symbol *msymbol;
- struct type *type;
- value_ptr blocklen;
- LONGEST maddr;
-
- /* Find the address of malloc in the inferior. */
-
- sym = lookup_symbol ("malloc", 0, VAR_NAMESPACE, 0, NULL);
- if (sym != NULL)
- {
- if (SYMBOL_CLASS (sym) != LOC_BLOCK)
- {
- error ("\"malloc\" exists in this program but is not a function.");
- }
- val = value_of_variable (sym, NULL);
- }
- else
- {
- msymbol = lookup_minimal_symbol ("malloc", NULL, NULL);
- if (msymbol != NULL)
- {
- type = lookup_pointer_type (builtin_type_char);
- type = lookup_function_type (type);
- type = lookup_pointer_type (type);
- maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol);
- val = value_from_longest (type, maddr);
- }
- else
- {
- error ("evaluation of this expression requires the program to have a function \"malloc\".");
- }
- }
-
- blocklen = value_from_longest (builtin_type_int, (LONGEST) len);
- val = call_function_by_hand (val, 1, &blocklen);
- if (value_logical_not (val))
- {
- error ("No memory available to program.");
- }
- return (value_as_long (val));
- }
-
- /* Cast value ARG2 to type TYPE and return as a value.
- More general than a C cast: accepts any two types of the same length,
- and if ARG2 is an lvalue it can be cast into anything at all. */
- /* In C++, casts may change pointer or object representations. */
-
- value_ptr
- value_cast (type, arg2)
- struct type *type;
- register value_ptr arg2;
- {
- register enum type_code code1;
- register enum type_code code2;
- register int scalar;
-
- if (VALUE_TYPE (arg2) == type)
- return arg2;
-
- COERCE_VARYING_ARRAY (arg2);
-
- /* Coerce arrays but not enums. Enums will work as-is
- and coercing them would cause an infinite recursion. */
- if (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_ENUM)
- COERCE_ARRAY (arg2);
-
- code1 = TYPE_CODE (type);
- code2 = TYPE_CODE (VALUE_TYPE (arg2));
-
- if (code1 == TYPE_CODE_COMPLEX)
- return cast_into_complex (type, arg2);
- if (code1 == TYPE_CODE_BOOL)
- code1 = TYPE_CODE_INT;
- if (code2 == TYPE_CODE_BOOL)
- code2 = TYPE_CODE_INT;
-
- scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT
- || code2 == TYPE_CODE_ENUM || code2 == TYPE_CODE_RANGE);
-
- if ( code1 == TYPE_CODE_STRUCT
- && code2 == TYPE_CODE_STRUCT
- && TYPE_NAME (type) != 0)
- {
- /* Look in the type of the source to see if it contains the
- type of the target as a superclass. If so, we'll need to
- offset the object in addition to changing its type. */
- value_ptr v = search_struct_field (type_name_no_tag (type),
- arg2, 0, VALUE_TYPE (arg2), 1);
- if (v)
- {
- VALUE_TYPE (v) = type;
- return v;
- }
- }
- if (code1 == TYPE_CODE_FLT && scalar)
- return value_from_double (type, value_as_double (arg2));
- else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM
- || code1 == TYPE_CODE_RANGE)
- && (scalar || code2 == TYPE_CODE_PTR))
- return value_from_longest (type, value_as_long (arg2));
- else if (TYPE_LENGTH (type) == TYPE_LENGTH (VALUE_TYPE (arg2)))
- {
- if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
- {
- /* Look in the type of the source to see if it contains the
- type of the target as a superclass. If so, we'll need to
- offset the pointer rather than just change its type. */
- struct type *t1 = TYPE_TARGET_TYPE (type);
- struct type *t2 = TYPE_TARGET_TYPE (VALUE_TYPE (arg2));
- if ( TYPE_CODE (t1) == TYPE_CODE_STRUCT
- && TYPE_CODE (t2) == TYPE_CODE_STRUCT
- && TYPE_NAME (t1) != 0) /* if name unknown, can't have supercl */
- {
- value_ptr v = search_struct_field (type_name_no_tag (t1),
- value_ind (arg2), 0, t2, 1);
- if (v)
- {
- v = value_addr (v);
- VALUE_TYPE (v) = type;
- return v;
- }
- }
- /* No superclass found, just fall through to change ptr type. */
- }
- VALUE_TYPE (arg2) = type;
- return arg2;
- }
- else if (chill_varying_type (type))
- {
- struct type *range1, *range2, *eltype1, *eltype2;
- value_ptr val;
- int count1, count2;
- char *valaddr, *valaddr_data;
- if (code2 == TYPE_CODE_BITSTRING)
- error ("not implemented: converting bitstring to varying type");
- if ((code2 != TYPE_CODE_ARRAY && code2 != TYPE_CODE_STRING)
- || (eltype1 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1)),
- eltype2 = TYPE_TARGET_TYPE (VALUE_TYPE (arg2)),
- (TYPE_LENGTH (eltype1) != TYPE_LENGTH (eltype2)
- /* || TYPE_CODE (eltype1) != TYPE_CODE (eltype2) */ )))
- error ("Invalid conversion to varying type");
- range1 = TYPE_FIELD_TYPE (TYPE_FIELD_TYPE (type, 1), 0);
- range2 = TYPE_FIELD_TYPE (VALUE_TYPE (arg2), 0);
- count1 = TYPE_HIGH_BOUND (range1) - TYPE_LOW_BOUND (range1) + 1;
- count2 = TYPE_HIGH_BOUND (range2) - TYPE_LOW_BOUND (range2) + 1;
- if (count2 > count1)
- error ("target varying type is too small");
- val = allocate_value (type);
- valaddr = VALUE_CONTENTS_RAW (val);
- valaddr_data = valaddr + TYPE_FIELD_BITPOS (type, 1) / 8;
- /* Set val's __var_length field to count2. */
- store_signed_integer (valaddr, TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)),
- count2);
- /* Set the __var_data field to count2 elements copied from arg2. */
- memcpy (valaddr_data, VALUE_CONTENTS (arg2),
- count2 * TYPE_LENGTH (eltype2));
- /* Zero the rest of the __var_data field of val. */
- memset (valaddr_data + count2 * TYPE_LENGTH (eltype2), '\0',
- (count1 - count2) * TYPE_LENGTH (eltype2));
- return val;
- }
- else if (VALUE_LVAL (arg2) == lval_memory)
- {
- return value_at_lazy (type, VALUE_ADDRESS (arg2) + VALUE_OFFSET (arg2));
- }
- else if (code1 == TYPE_CODE_VOID)
- {
- return value_zero (builtin_type_void, not_lval);
- }
- else
- {
- error ("Invalid cast.");
- return 0;
- }
- }
-
- /* Create a value of type TYPE that is zero, and return it. */
-
- value_ptr
- value_zero (type, lv)
- struct type *type;
- enum lval_type lv;
- {
- register value_ptr val = allocate_value (type);
-
- memset (VALUE_CONTENTS (val), 0, TYPE_LENGTH (type));
- VALUE_LVAL (val) = lv;
-
- return val;
- }
-
- /* Return a value with type TYPE located at ADDR.
-
- Call value_at only if the data needs to be fetched immediately;
- if we can be 'lazy' and defer the fetch, perhaps indefinately, call
- value_at_lazy instead. value_at_lazy simply records the address of
- the data and sets the lazy-evaluation-required flag. The lazy flag
- is tested in the VALUE_CONTENTS macro, which is used if and when
- the contents are actually required. */
-
- value_ptr
- value_at (type, addr)
- struct type *type;
- CORE_ADDR addr;
- {
- register value_ptr val;
-
- if (TYPE_CODE (type) == TYPE_CODE_VOID)
- error ("Attempt to dereference a generic pointer.");
-
- val = allocate_value (type);
-
- read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (type));
-
- VALUE_LVAL (val) = lval_memory;
- VALUE_ADDRESS (val) = addr;
-
- return val;
- }
-
- /* Return a lazy value with type TYPE located at ADDR (cf. value_at). */
-
- value_ptr
- value_at_lazy (type, addr)
- struct type *type;
- CORE_ADDR addr;
- {
- register value_ptr val;
-
- if (TYPE_CODE (type) == TYPE_CODE_VOID)
- error ("Attempt to dereference a generic pointer.");
-
- val = allocate_value (type);
-
- VALUE_LVAL (val) = lval_memory;
- VALUE_ADDRESS (val) = addr;
- VALUE_LAZY (val) = 1;
-
- return val;
- }
-
- /* Called only from the VALUE_CONTENTS macro, if the current data for
- a variable needs to be loaded into VALUE_CONTENTS(VAL). Fetches the
- data from the user's process, and clears the lazy flag to indicate
- that the data in the buffer is valid.
-
- If the value is zero-length, we avoid calling read_memory, which would
- abort. We mark the value as fetched anyway -- all 0 bytes of it.
-
- This function returns a value because it is used in the VALUE_CONTENTS
- macro as part of an expression, where a void would not work. The
- value is ignored. */
-
- int
- value_fetch_lazy (val)
- register value_ptr val;
- {
- CORE_ADDR addr = VALUE_ADDRESS (val) + VALUE_OFFSET (val);
-
- if (TYPE_LENGTH (VALUE_TYPE (val)))
- read_memory (addr, VALUE_CONTENTS_RAW (val),
- TYPE_LENGTH (VALUE_TYPE (val)));
- VALUE_LAZY (val) = 0;
- return 0;
- }
-
-
- /* Store the contents of FROMVAL into the location of TOVAL.
- Return a new value with the location of TOVAL and contents of FROMVAL. */
-
- value_ptr
- value_assign (toval, fromval)
- register value_ptr toval, fromval;
- {
- register struct type *type;
- register value_ptr val;
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
- int use_buffer = 0;
-
- if (!toval->modifiable)
- error ("Left operand of assignment is not a modifiable lvalue.");
-
- COERCE_ARRAY (fromval);
- COERCE_REF (toval);
-
- type = VALUE_TYPE (toval);
- if (VALUE_LVAL (toval) != lval_internalvar)
- fromval = value_cast (type, fromval);
-
- /* If TOVAL is a special machine register requiring conversion
- of program values to a special raw format,
- convert FROMVAL's contents now, with result in `raw_buffer',
- and set USE_BUFFER to the number of bytes to write. */
-
- #ifdef REGISTER_CONVERTIBLE
- if (VALUE_REGNO (toval) >= 0
- && REGISTER_CONVERTIBLE (VALUE_REGNO (toval)))
- {
- int regno = VALUE_REGNO (toval);
- if (REGISTER_CONVERTIBLE (regno))
- {
- REGISTER_CONVERT_TO_RAW (VALUE_TYPE (fromval), regno,
- VALUE_CONTENTS (fromval), raw_buffer);
- use_buffer = REGISTER_RAW_SIZE (regno);
- }
- }
- #endif
-
- switch (VALUE_LVAL (toval))
- {
- case lval_internalvar:
- set_internalvar (VALUE_INTERNALVAR (toval), fromval);
- break;
-
- case lval_internalvar_component:
- set_internalvar_component (VALUE_INTERNALVAR (toval),
- VALUE_OFFSET (toval),
- VALUE_BITPOS (toval),
- VALUE_BITSIZE (toval),
- fromval);
- break;
-
- case lval_memory:
- if (VALUE_BITSIZE (toval))
- {
- char buffer[sizeof (LONGEST)];
- /* We assume that the argument to read_memory is in units of
- host chars. FIXME: Is that correct? */
- int len = (VALUE_BITPOS (toval)
- + VALUE_BITSIZE (toval)
- + HOST_CHAR_BIT - 1)
- / HOST_CHAR_BIT;
-
- if (len > sizeof (LONGEST))
- error ("Can't handle bitfields which don't fit in a %d bit word.",
- sizeof (LONGEST) * HOST_CHAR_BIT);
-
- read_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- buffer, len);
- modify_field (buffer, value_as_long (fromval),
- VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
- write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- buffer, len);
- }
- else if (use_buffer)
- write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- raw_buffer, use_buffer);
- else
- write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
- break;
-
- case lval_register:
- if (VALUE_BITSIZE (toval))
- {
- char buffer[sizeof (LONGEST)];
- int len = REGISTER_RAW_SIZE (VALUE_REGNO (toval));
-
- if (len > sizeof (LONGEST))
- error ("Can't handle bitfields in registers larger than %d bits.",
- sizeof (LONGEST) * HOST_CHAR_BIT);
-
- if (VALUE_BITPOS (toval) + VALUE_BITSIZE (toval)
- > len * HOST_CHAR_BIT)
- /* Getting this right would involve being very careful about
- byte order. */
- error ("\
- Can't handle bitfield which doesn't fit in a single register.");
-
- read_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- buffer, len);
- modify_field (buffer, value_as_long (fromval),
- VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
- write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- buffer, len);
- }
- else if (use_buffer)
- write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- raw_buffer, use_buffer);
- else
- {
- /* Do any conversion necessary when storing this type to more
- than one register. */
- #ifdef REGISTER_CONVERT_FROM_TYPE
- memcpy (raw_buffer, VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
- REGISTER_CONVERT_FROM_TYPE(VALUE_REGNO (toval), type, raw_buffer);
- write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- raw_buffer, TYPE_LENGTH (type));
- #else
- write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
- VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
- #endif
- }
- /* Assigning to the stack pointer, frame pointer, and other
- (architecture and calling convention specific) registers may
- cause the frame cache to be out of date. We just do this
- on all assignments to registers for simplicity; I doubt the slowdown
- matters. */
- reinit_frame_cache ();
- break;
-
- case lval_reg_frame_relative:
- {
- /* value is stored in a series of registers in the frame
- specified by the structure. Copy that value out, modify
- it, and copy it back in. */
- int amount_to_copy = (VALUE_BITSIZE (toval) ? 1 : TYPE_LENGTH (type));
- int reg_size = REGISTER_RAW_SIZE (VALUE_FRAME_REGNUM (toval));
- int byte_offset = VALUE_OFFSET (toval) % reg_size;
- int reg_offset = VALUE_OFFSET (toval) / reg_size;
- int amount_copied;
-
- /* Make the buffer large enough in all cases. */
- char *buffer = (char *) alloca (amount_to_copy
- + sizeof (LONGEST)
- + MAX_REGISTER_RAW_SIZE);
-
- int regno;
- struct frame_info *frame;
-
- /* Figure out which frame this is in currently. */
- for (frame = get_current_frame ();
- frame && FRAME_FP (frame) != VALUE_FRAME (toval);
- frame = get_prev_frame (frame))
- ;
-
- if (!frame)
- error ("Value being assigned to is no longer active.");
-
- amount_to_copy += (reg_size - amount_to_copy % reg_size);
-
- /* Copy it out. */
- for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
- amount_copied = 0);
- amount_copied < amount_to_copy;
- amount_copied += reg_size, regno++)
- {
- get_saved_register (buffer + amount_copied,
- (int *)NULL, (CORE_ADDR *)NULL,
- frame, regno, (enum lval_type *)NULL);
- }
-
- /* Modify what needs to be modified. */
- if (VALUE_BITSIZE (toval))
- modify_field (buffer + byte_offset,
- value_as_long (fromval),
- VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
- else if (use_buffer)
- memcpy (buffer + byte_offset, raw_buffer, use_buffer);
- else
- memcpy (buffer + byte_offset, VALUE_CONTENTS (fromval),
- TYPE_LENGTH (type));
-
- /* Copy it back. */
- for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
- amount_copied = 0);
- amount_copied < amount_to_copy;
- amount_copied += reg_size, regno++)
- {
- enum lval_type lval;
- CORE_ADDR addr;
- int optim;
-
- /* Just find out where to put it. */
- get_saved_register ((char *)NULL,
- &optim, &addr, frame, regno, &lval);
-
- if (optim)
- error ("Attempt to assign to a value that was optimized out.");
- if (lval == lval_memory)
- write_memory (addr, buffer + amount_copied, reg_size);
- else if (lval == lval_register)
- write_register_bytes (addr, buffer + amount_copied, reg_size);
- else
- error ("Attempt to assign to an unmodifiable value.");
- }
- }
- break;
-
-
- default:
- error ("Left operand of assignment is not an lvalue.");
- }
-
- /* Return a value just like TOVAL except with the contents of FROMVAL
- (except in the case of the type if TOVAL is an internalvar). */
-
- if (VALUE_LVAL (toval) == lval_internalvar
- || VALUE_LVAL (toval) == lval_internalvar_component)
- {
- type = VALUE_TYPE (fromval);
- }
-
- val = allocate_value (type);
- memcpy (val, toval, VALUE_CONTENTS_RAW (val) - (char *) val);
- memcpy (VALUE_CONTENTS_RAW (val), VALUE_CONTENTS (fromval),
- TYPE_LENGTH (type));
- VALUE_TYPE (val) = type;
-
- return val;
- }
-
- /* Extend a value VAL to COUNT repetitions of its type. */
-
- value_ptr
- value_repeat (arg1, count)
- value_ptr arg1;
- int count;
- {
- register value_ptr val;
-
- if (VALUE_LVAL (arg1) != lval_memory)
- error ("Only values in memory can be extended with '@'.");
- if (count < 1)
- error ("Invalid number %d of repetitions.", count);
-
- val = allocate_repeat_value (VALUE_TYPE (arg1), count);
-
- read_memory (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1),
- VALUE_CONTENTS_RAW (val),
- TYPE_LENGTH (VALUE_TYPE (val)) * count);
- VALUE_LVAL (val) = lval_memory;
- VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1);
-
- return val;
- }
-
- value_ptr
- value_of_variable (var, b)
- struct symbol *var;
- struct block *b;
- {
- value_ptr val;
- struct frame_info *frame;
-
- if (b == NULL)
- /* Use selected frame. */
- frame = NULL;
- else
- {
- frame = block_innermost_frame (b);
- if (frame == NULL && symbol_read_needs_frame (var))
- {
- if (BLOCK_FUNCTION (b) != NULL
- && SYMBOL_NAME (BLOCK_FUNCTION (b)) != NULL)
- error ("No frame is currently executing in block %s.",
- SYMBOL_NAME (BLOCK_FUNCTION (b)));
- else
- error ("No frame is currently executing in specified block");
- }
- }
- val = read_var_value (var, frame);
- if (val == 0)
- error ("Address of symbol \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var));
- return val;
- }
-
- /* Given a value which is an array, return a value which is a pointer to its
- first element, regardless of whether or not the array has a nonzero lower
- bound.
-
- FIXME: A previous comment here indicated that this routine should be
- substracting the array's lower bound. It's not clear to me that this
- is correct. Given an array subscripting operation, it would certainly
- work to do the adjustment here, essentially computing:
-
- (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0])
-
- However I believe a more appropriate and logical place to account for
- the lower bound is to do so in value_subscript, essentially computing:
-
- (&array[0] + ((index - lowerbound) * sizeof array[0]))
-
- As further evidence consider what would happen with operations other
- than array subscripting, where the caller would get back a value that
- had an address somewhere before the actual first element of the array,
- and the information about the lower bound would be lost because of
- the coercion to pointer type.
- */
-
- value_ptr
- value_coerce_array (arg1)
- value_ptr arg1;
- {
- register struct type *type;
-
- if (VALUE_LVAL (arg1) != lval_memory)
- error ("Attempt to take address of value not located in memory.");
-
- /* Get type of elements. */
- if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_ARRAY
- || TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRING)
- type = TYPE_TARGET_TYPE (VALUE_TYPE (arg1));
- else
- /* A phony array made by value_repeat.
- Its type is the type of the elements, not an array type. */
- type = VALUE_TYPE (arg1);
-
- return value_from_longest (lookup_pointer_type (type),
- (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
- }
-
- /* Given a value which is a function, return a value which is a pointer
- to it. */
-
- value_ptr
- value_coerce_function (arg1)
- value_ptr arg1;
- {
-
- if (VALUE_LVAL (arg1) != lval_memory)
- error ("Attempt to take address of value not located in memory.");
-
- return value_from_longest (lookup_pointer_type (VALUE_TYPE (arg1)),
- (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
- }
-
- /* Return a pointer value for the object for which ARG1 is the contents. */
-
- value_ptr
- value_addr (arg1)
- value_ptr arg1;
- {
- struct type *type = VALUE_TYPE (arg1);
- if (TYPE_CODE (type) == TYPE_CODE_REF)
- {
- /* Copy the value, but change the type from (T&) to (T*).
- We keep the same location information, which is efficient,
- and allows &(&X) to get the location containing the reference. */
- value_ptr arg2 = value_copy (arg1);
- VALUE_TYPE (arg2) = lookup_pointer_type (TYPE_TARGET_TYPE (type));
- return arg2;
- }
- if (current_language->c_style_arrays
- && (VALUE_REPEATED (arg1)
- || TYPE_CODE (type) == TYPE_CODE_ARRAY))
- return value_coerce_array (arg1);
- if (TYPE_CODE (type) == TYPE_CODE_FUNC)
- return value_coerce_function (arg1);
-
- if (VALUE_LVAL (arg1) != lval_memory)
- error ("Attempt to take address of value not located in memory.");
-
- return value_from_longest (lookup_pointer_type (type),
- (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
- }
-
- /* Given a value of a pointer type, apply the C unary * operator to it. */
-
- value_ptr
- value_ind (arg1)
- value_ptr arg1;
- {
- COERCE_ARRAY (arg1);
-
- if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_MEMBER)
- error ("not implemented: member types in value_ind");
-
- /* Allow * on an integer so we can cast it to whatever we want.
- This returns an int, which seems like the most C-like thing
- to do. "long long" variables are rare enough that
- BUILTIN_TYPE_LONGEST would seem to be a mistake. */
- if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT)
- return value_at (builtin_type_int,
- (CORE_ADDR) value_as_long (arg1));
- else if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
- return value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)),
- value_as_pointer (arg1));
- error ("Attempt to take contents of a non-pointer value.");
- return 0; /* For lint -- never reached */
- }
-
- /* Pushing small parts of stack frames. */
-
- /* Push one word (the size of object that a register holds). */
-
- CORE_ADDR
- push_word (sp, word)
- CORE_ADDR sp;
- unsigned LONGEST word;
- {
- register int len = REGISTER_SIZE;
- char buffer[MAX_REGISTER_RAW_SIZE];
-
- store_unsigned_integer (buffer, len, word);
- #if 1 INNER_THAN 2
- sp -= len;
- write_memory (sp, buffer, len);
- #else /* stack grows upward */
- write_memory (sp, buffer, len);
- sp += len;
- #endif /* stack grows upward */
-
- return sp;
- }
-
- /* Push LEN bytes with data at BUFFER. */
-
- CORE_ADDR
- push_bytes (sp, buffer, len)
- CORE_ADDR sp;
- char *buffer;
- int len;
- {
- #if 1 INNER_THAN 2
- sp -= len;
- write_memory (sp, buffer, len);
- #else /* stack grows upward */
- write_memory (sp, buffer, len);
- sp += len;
- #endif /* stack grows upward */
-
- return sp;
- }
-
- /* Push onto the stack the specified value VALUE. */
-
- static CORE_ADDR
- value_push (sp, arg)
- register CORE_ADDR sp;
- value_ptr arg;
- {
- register int len = TYPE_LENGTH (VALUE_TYPE (arg));
-
- #if 1 INNER_THAN 2
- sp -= len;
- write_memory (sp, VALUE_CONTENTS (arg), len);
- #else /* stack grows upward */
- write_memory (sp, VALUE_CONTENTS (arg), len);
- sp += len;
- #endif /* stack grows upward */
-
- return sp;
- }
-
- /* Perform the standard coercions that are specified
- for arguments to be passed to C functions. */
-
- value_ptr
- value_arg_coerce (arg)
- value_ptr arg;
- {
- register struct type *type;
-
- /* FIXME: We should coerce this according to the prototype (if we have
- one). Right now we do a little bit of this in typecmp(), but that
- doesn't always get called. For example, if passing a ref to a function
- without a prototype, we probably should de-reference it. Currently
- we don't. */
-
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM)
- arg = value_cast (builtin_type_unsigned_int, arg);
-
- #if 1 /* FIXME: This is only a temporary patch. -fnf */
- if (current_language->c_style_arrays
- && (VALUE_REPEATED (arg)
- || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY))
- arg = value_coerce_array (arg);
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC)
- arg = value_coerce_function (arg);
- #endif
-
- type = VALUE_TYPE (arg);
-
- if (TYPE_CODE (type) == TYPE_CODE_INT
- && TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
- return value_cast (builtin_type_int, arg);
-
- if (TYPE_CODE (type) == TYPE_CODE_FLT
- && TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double))
- return value_cast (builtin_type_double, arg);
-
- return arg;
- }
-
- /* Push the value ARG, first coercing it as an argument
- to a C function. */
-
- static CORE_ADDR
- value_arg_push (sp, arg)
- register CORE_ADDR sp;
- value_ptr arg;
- {
- return value_push (sp, value_arg_coerce (arg));
- }
-
- /* Determine a function's address and its return type from its value.
- Calls error() if the function is not valid for calling. */
-
- static CORE_ADDR
- find_function_addr (function, retval_type)
- value_ptr function;
- struct type **retval_type;
- {
- register struct type *ftype = VALUE_TYPE (function);
- register enum type_code code = TYPE_CODE (ftype);
- struct type *value_type;
- CORE_ADDR funaddr;
-
- /* If it's a member function, just look at the function
- part of it. */
-
- /* Determine address to call. */
- if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD)
- {
- funaddr = VALUE_ADDRESS (function);
- value_type = TYPE_TARGET_TYPE (ftype);
- }
- else if (code == TYPE_CODE_PTR)
- {
- funaddr = value_as_pointer (function);
- if (TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_FUNC
- || TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_METHOD)
- {
- #ifdef CONVERT_FROM_FUNC_PTR_ADDR
- /* FIXME: This is a workaround for the unusual function
- pointer representation on the RS/6000, see comment
- in config/rs6000/tm-rs6000.h */
- funaddr = CONVERT_FROM_FUNC_PTR_ADDR (funaddr);
- #endif
- value_type = TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (ftype));
- }
- else
- value_type = builtin_type_int;
- }
- else if (code == 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_pointer (value_addr (function));
- else
- /* Handle integer used as address of a function. */
- funaddr = (CORE_ADDR) value_as_long (function);
-
- value_type = builtin_type_int;
- }
- else
- error ("Invalid data type for function to be called.");
-
- *retval_type = value_type;
- return funaddr;
- }
-
- #if defined (CALL_DUMMY)
- /* All this stuff with a dummy frame may seem unnecessarily complicated
- (why not just save registers in GDB?). The purpose of pushing a dummy
- frame which looks just like a real frame is so that if you call a
- function and then hit a breakpoint (get a signal, etc), "backtrace"
- will look right. Whether the backtrace needs to actually show the
- stack at the time the inferior function was called is debatable, but
- it certainly needs to not display garbage. So if you are contemplating
- making dummy frames be different from normal frames, consider that. */
-
- /* Perform a function call in the inferior.
- ARGS is a vector of values of arguments (NARGS of them).
- FUNCTION is a value, the function to be called.
- Returns a value representing what the function returned.
- May fail to return, if a breakpoint or signal is hit
- during the execution of the function. */
-
- value_ptr
- call_function_by_hand (function, nargs, args)
- value_ptr function;
- int nargs;
- value_ptr *args;
- {
- register CORE_ADDR sp;
- register int i;
- CORE_ADDR start_sp;
- /* CALL_DUMMY is an array of words (REGISTER_SIZE), but each word
- is in host byte order. Before calling FIX_CALL_DUMMY, we byteswap it
- and remove any extra bytes which might exist because unsigned LONGEST is
- bigger than REGISTER_SIZE. */
- static unsigned LONGEST dummy[] = CALL_DUMMY;
- char dummy1[REGISTER_SIZE * sizeof dummy / sizeof (unsigned LONGEST)];
- CORE_ADDR old_sp;
- struct type *value_type;
- unsigned char struct_return;
- CORE_ADDR struct_addr;
- struct inferior_status inf_status;
- struct cleanup *old_chain;
- CORE_ADDR funaddr;
- int using_gcc;
- CORE_ADDR real_pc;
-
- if (!target_has_execution)
- noprocess();
-
- save_inferior_status (&inf_status, 1);
- old_chain = make_cleanup (restore_inferior_status, &inf_status);
-
- /* PUSH_DUMMY_FRAME is responsible for saving the inferior registers
- (and POP_FRAME for restoring them). (At least on most machines)
- they are saved on the stack in the inferior. */
- PUSH_DUMMY_FRAME;
-
- old_sp = sp = read_sp ();
-
- #if 1 INNER_THAN 2 /* Stack grows down */
- sp -= sizeof dummy1;
- start_sp = sp;
- #else /* Stack grows up */
- start_sp = sp;
- sp += sizeof dummy1;
- #endif
-
- funaddr = find_function_addr (function, &value_type);
-
- {
- struct block *b = block_for_pc (funaddr);
- /* If compiled without -g, assume GCC. */
- using_gcc = b == NULL || BLOCK_GCC_COMPILED (b);
- }
-
- /* Are we returning a value using a structure return or a normal
- value return? */
-
- struct_return = using_struct_return (function, funaddr, value_type,
- using_gcc);
-
- /* Create a call sequence customized for this function
- and the number of arguments for it. */
- for (i = 0; i < sizeof dummy / sizeof (dummy[0]); i++)
- store_unsigned_integer (&dummy1[i * REGISTER_SIZE],
- REGISTER_SIZE,
- (unsigned LONGEST)dummy[i]);
-
- #ifdef GDB_TARGET_IS_HPPA
- real_pc = FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args,
- value_type, using_gcc);
- #else
- FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args,
- value_type, using_gcc);
- real_pc = start_sp;
- #endif
-
- #if CALL_DUMMY_LOCATION == ON_STACK
- write_memory (start_sp, (char *)dummy1, sizeof dummy1);
- #endif /* On stack. */
-
- #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END
- /* Convex Unix prohibits executing in the stack segment. */
- /* Hope there is empty room at the top of the text segment. */
- {
- extern CORE_ADDR text_end;
- static checked = 0;
- if (!checked)
- for (start_sp = text_end - sizeof dummy1; start_sp < text_end; ++start_sp)
- if (read_memory_integer (start_sp, 1) != 0)
- error ("text segment full -- no place to put call");
- checked = 1;
- sp = old_sp;
- real_pc = text_end - sizeof dummy1;
- write_memory (real_pc, (char *)dummy1, sizeof dummy1);
- }
- #endif /* Before text_end. */
-
- #if CALL_DUMMY_LOCATION == AFTER_TEXT_END
- {
- extern CORE_ADDR text_end;
- int errcode;
- sp = old_sp;
- real_pc = text_end;
- errcode = target_write_memory (real_pc, (char *)dummy1, sizeof dummy1);
- if (errcode != 0)
- error ("Cannot write text segment -- call_function failed");
- }
- #endif /* After text_end. */
-
- #if CALL_DUMMY_LOCATION == AT_ENTRY_POINT
- real_pc = funaddr;
- #endif /* At entry point. */
-
- #ifdef lint
- sp = old_sp; /* It really is used, for some ifdef's... */
- #endif
-
- #ifdef STACK_ALIGN
- /* If stack grows down, we must leave a hole at the top. */
- {
- int len = 0;
-
- /* Reserve space for the return structure to be written on the
- stack, if necessary */
-
- if (struct_return)
- len += TYPE_LENGTH (value_type);
-
- for (i = nargs - 1; i >= 0; i--)
- len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));
- #ifdef CALL_DUMMY_STACK_ADJUST
- len += CALL_DUMMY_STACK_ADJUST;
- #endif
- #if 1 INNER_THAN 2
- sp -= STACK_ALIGN (len) - len;
- #else
- sp += STACK_ALIGN (len) - len;
- #endif
- }
- #endif /* STACK_ALIGN */
-
- /* Reserve space for the return structure to be written on the
- stack, if necessary */
-
- if (struct_return)
- {
- #if 1 INNER_THAN 2
- sp -= TYPE_LENGTH (value_type);
- struct_addr = sp;
- #else
- struct_addr = sp;
- sp += TYPE_LENGTH (value_type);
- #endif
- }
-
- #if defined (REG_STRUCT_HAS_ADDR)
- {
- /* This is a machine like the sparc, where we may need to pass a pointer
- to the structure, not the structure itself. */
- for (i = nargs - 1; i >= 0; i--)
- if (TYPE_CODE (VALUE_TYPE (args[i])) == TYPE_CODE_STRUCT
- && REG_STRUCT_HAS_ADDR (using_gcc, VALUE_TYPE (args[i])))
- {
- CORE_ADDR addr;
- #if !(1 INNER_THAN 2)
- /* The stack grows up, so the address of the thing we push
- is the stack pointer before we push it. */
- addr = sp;
- #endif
- /* Push the structure. */
- sp = value_push (sp, args[i]);
- #if 1 INNER_THAN 2
- /* The stack grows down, so the address of the thing we push
- is the stack pointer after we push it. */
- addr = sp;
- #endif
- /* The value we're going to pass is the address of the thing
- we just pushed. */
- args[i] = value_from_longest (lookup_pointer_type (value_type),
- (LONGEST) addr);
- }
- }
- #endif /* REG_STRUCT_HAS_ADDR. */
-
- #ifdef PUSH_ARGUMENTS
- PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr);
- #else /* !PUSH_ARGUMENTS */
- for (i = nargs - 1; i >= 0; i--)
- sp = value_arg_push (sp, args[i]);
- #endif /* !PUSH_ARGUMENTS */
-
- #ifdef CALL_DUMMY_STACK_ADJUST
- #if 1 INNER_THAN 2
- sp -= CALL_DUMMY_STACK_ADJUST;
- #else
- sp += CALL_DUMMY_STACK_ADJUST;
- #endif
- #endif /* CALL_DUMMY_STACK_ADJUST */
-
- /* Store the address at which the structure is supposed to be
- written. Note that this (and the code which reserved the space
- above) assumes that gcc was used to compile this function. Since
- it doesn't cost us anything but space and if the function is pcc
- it will ignore this value, we will make that assumption.
-
- Also note that on some machines (like the sparc) pcc uses a
- convention like gcc's. */
-
- if (struct_return)
- STORE_STRUCT_RETURN (struct_addr, sp);
-
- /* Write the stack pointer. This is here because the statements above
- might fool with it. On SPARC, this write also stores the register
- window into the right place in the new stack frame, which otherwise
- wouldn't happen. (See store_inferior_registers in sparc-nat.c.) */
- write_sp (sp);
-
- {
- char retbuf[REGISTER_BYTES];
- char *name;
- struct symbol *symbol;
-
- name = NULL;
- symbol = find_pc_function (funaddr);
- if (symbol)
- {
- name = SYMBOL_SOURCE_NAME (symbol);
- }
- else
- {
- /* Try the minimal symbols. */
- struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr);
-
- if (msymbol)
- {
- name = SYMBOL_SOURCE_NAME (msymbol);
- }
- }
- if (name == NULL)
- {
- char format[80];
- sprintf (format, "at %s", local_hex_format ());
- name = alloca (80);
- /* FIXME-32x64: assumes funaddr fits in a long. */
- sprintf (name, format, (unsigned long) funaddr);
- }
-
- /* Execute the stack dummy routine, calling FUNCTION.
- When it is done, discard the empty frame
- after storing the contents of all regs into retbuf. */
- if (run_stack_dummy (real_pc + CALL_DUMMY_START_OFFSET, retbuf))
- {
- /* We stopped somewhere besides the call dummy. */
-
- /* If we did the cleanups, we would print a spurious error message
- (Unable to restore previously selected frame), would write the
- registers from the inf_status (which is wrong), and would do other
- wrong things (like set stop_bpstat to the wrong thing). */
- discard_cleanups (old_chain);
- /* Prevent memory leak. */
- bpstat_clear (&inf_status.stop_bpstat);
-
- /* The following error message used to say "The expression
- which contained the function call has been discarded." It
- is a hard concept to explain in a few words. Ideally, GDB
- would be able to resume evaluation of the expression when
- the function finally is done executing. Perhaps someday
- this will be implemented (it would not be easy). */
-
- /* FIXME: Insert a bunch of wrap_here; name can be very long if it's
- a C++ name with arguments and stuff. */
- error ("\
- The program being debugged stopped while in a function called from GDB.\n\
- When the function (%s) is done executing, GDB will silently\n\
- stop (instead of continuing to evaluate the expression containing\n\
- the function call).", name);
- }
-
- do_cleanups (old_chain);
-
- /* Figure out the value returned by the function. */
- return value_being_returned (value_type, retbuf, struct_return);
- }
- }
- #else /* no CALL_DUMMY. */
- value_ptr
- call_function_by_hand (function, nargs, args)
- value_ptr function;
- int nargs;
- value_ptr *args;
- {
- error ("Cannot invoke functions on this machine.");
- }
- #endif /* no CALL_DUMMY. */
-
-
- /* Create a value for an array by allocating space in the inferior, copying
- the data into that space, and then setting up an array value.
-
- The array bounds are set from LOWBOUND and HIGHBOUND, and the array is
- populated from the values passed in ELEMVEC.
-
- The element type of the array is inherited from the type of the
- first element, and all elements must have the same size (though we
- don't currently enforce any restriction on their types). */
-
- value_ptr
- value_array (lowbound, highbound, elemvec)
- int lowbound;
- int highbound;
- value_ptr *elemvec;
- {
- int nelem;
- int idx;
- int typelength;
- value_ptr val;
- struct type *rangetype;
- struct type *arraytype;
- CORE_ADDR addr;
-
- /* Validate that the bounds are reasonable and that each of the elements
- have the same size. */
-
- nelem = highbound - lowbound + 1;
- if (nelem <= 0)
- {
- error ("bad array bounds (%d, %d)", lowbound, highbound);
- }
- typelength = TYPE_LENGTH (VALUE_TYPE (elemvec[0]));
- for (idx = 0; idx < nelem; idx++)
- {
- if (TYPE_LENGTH (VALUE_TYPE (elemvec[idx])) != typelength)
- {
- error ("array elements must all be the same size");
- }
- }
-
- /* Allocate space to store the array in the inferior, and then initialize
- it by copying in each element. FIXME: Is it worth it to create a
- local buffer in which to collect each value and then write all the
- bytes in one operation? */
-
- addr = allocate_space_in_inferior (nelem * typelength);
- for (idx = 0; idx < nelem; idx++)
- {
- write_memory (addr + (idx * typelength), VALUE_CONTENTS (elemvec[idx]),
- typelength);
- }
-
- /* Create the array type and set up an array value to be evaluated lazily. */
-
- rangetype = create_range_type ((struct type *) NULL, builtin_type_int,
- lowbound, highbound);
- arraytype = create_array_type ((struct type *) NULL,
- VALUE_TYPE (elemvec[0]), rangetype);
- val = value_at_lazy (arraytype, addr);
- return (val);
- }
-
- /* Create a value for a string constant by allocating space in the inferior,
- copying the data into that space, and returning the address with type
- TYPE_CODE_STRING. PTR points to the string constant data; LEN is number
- of characters.
- Note that string types are like array of char types with a lower bound of
- zero and an upper bound of LEN - 1. Also note that the string may contain
- embedded null bytes. */
-
- value_ptr
- value_string (ptr, len)
- char *ptr;
- int len;
- {
- value_ptr val;
- int lowbound = current_language->string_lower_bound;
- struct type *rangetype = create_range_type ((struct type *) NULL,
- builtin_type_int,
- lowbound, len + lowbound - 1);
- struct type *stringtype
- = create_string_type ((struct type *) NULL, rangetype);
- CORE_ADDR addr;
-
- if (current_language->c_style_arrays == 0)
- {
- val = allocate_value (stringtype);
- memcpy (VALUE_CONTENTS_RAW (val), ptr, len);
- return val;
- }
-
-
- /* Allocate space to store the string in the inferior, and then
- copy LEN bytes from PTR in gdb to that address in the inferior. */
-
- addr = allocate_space_in_inferior (len);
- write_memory (addr, ptr, len);
-
- val = value_at_lazy (stringtype, addr);
- return (val);
- }
-
- value_ptr
- value_bitstring (ptr, len)
- char *ptr;
- int len;
- {
- value_ptr val;
- struct type *domain_type = create_range_type (NULL, builtin_type_int,
- 0, len - 1);
- struct type *type = create_set_type ((struct type*) NULL, domain_type);
- TYPE_CODE (type) = TYPE_CODE_BITSTRING;
- val = allocate_value (type);
- memcpy (VALUE_CONTENTS_RAW (val), ptr, TYPE_LENGTH (type) / TARGET_CHAR_BIT);
- return val;
- }
-
- /* See if we can pass arguments in T2 to a function which takes arguments
- of types T1. Both t1 and t2 are NULL-terminated vectors. If some
- arguments need coercion of some sort, then the coerced values are written
- into T2. Return value is 0 if the arguments could be matched, or the
- position at which they differ if not.
-
- STATICP is nonzero if the T1 argument list came from a
- static member function.
-
- For non-static member functions, we ignore the first argument,
- which is the type of the instance variable. This is because we want
- to handle calls with objects from derived classes. This is not
- entirely correct: we should actually check to make sure that a
- requested operation is type secure, shouldn't we? FIXME. */
-
- static int
- typecmp (staticp, t1, t2)
- int staticp;
- struct type *t1[];
- value_ptr t2[];
- {
- int i;
-
- if (t2 == 0)
- return 1;
- if (staticp && t1 == 0)
- return t2[1] != 0;
- if (t1 == 0)
- return 1;
- if (TYPE_CODE (t1[0]) == TYPE_CODE_VOID) return 0;
- if (t1[!staticp] == 0) return 0;
- for (i = !staticp; t1[i] && TYPE_CODE (t1[i]) != TYPE_CODE_VOID; i++)
- {
- struct type *tt1, *tt2;
- if (! t2[i])
- return i+1;
- tt1 = t1[i];
- tt2 = VALUE_TYPE(t2[i]);
- if (TYPE_CODE (tt1) == TYPE_CODE_REF
- /* We should be doing hairy argument matching, as below. */
- && (TYPE_CODE (TYPE_TARGET_TYPE (tt1)) == TYPE_CODE (tt2)))
- {
- t2[i] = value_addr (t2[i]);
- continue;
- }
-
- while (TYPE_CODE (tt1) == TYPE_CODE_PTR
- && (TYPE_CODE(tt2)==TYPE_CODE_ARRAY || TYPE_CODE(tt2)==TYPE_CODE_PTR))
- {
- tt1 = TYPE_TARGET_TYPE(tt1);
- tt2 = TYPE_TARGET_TYPE(tt2);
- }
- if (TYPE_CODE(tt1) == TYPE_CODE(tt2)) continue;
- /* Array to pointer is a `trivial conversion' according to the ARM. */
-
- /* We should be doing much hairier argument matching (see section 13.2
- of the ARM), but as a quick kludge, just check for the same type
- code. */
- if (TYPE_CODE (t1[i]) != TYPE_CODE (VALUE_TYPE (t2[i])))
- return i+1;
- }
- if (!t1[i]) return 0;
- return t2[i] ? i+1 : 0;
- }
-
- /* Helper function used by value_struct_elt to recurse through baseclasses.
- Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes,
- and search in it assuming it has (class) type TYPE.
- If found, return value, else return NULL.
-
- If LOOKING_FOR_BASECLASS, then instead of looking for struct fields,
- look for a baseclass named NAME. */
-
- static value_ptr
- search_struct_field (name, arg1, offset, type, looking_for_baseclass)
- char *name;
- register value_ptr arg1;
- int offset;
- register struct type *type;
- int looking_for_baseclass;
- {
- int i;
-
- check_stub_type (type);
-
- if (! looking_for_baseclass)
- for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
- {
- char *t_field_name = TYPE_FIELD_NAME (type, i);
-
- if (t_field_name && STREQ (t_field_name, name))
- {
- value_ptr v;
- if (TYPE_FIELD_STATIC (type, i))
- {
- char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, i);
- struct symbol *sym =
- lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL);
- if (sym == NULL)
- error ("Internal error: could not find physical static variable named %s",
- phys_name);
- v = value_at (TYPE_FIELD_TYPE (type, i),
- (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym));
- }
- else
- v = value_primitive_field (arg1, offset, i, type);
- if (v == 0)
- error("there is no field named %s", name);
- return v;
- }
- if (t_field_name && t_field_name[0] == '\0'
- && TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_UNION)
- {
- /* Look for a match through the fields of an anonymous union. */
- value_ptr v;
- v = search_struct_field (name, arg1, offset,
- TYPE_FIELD_TYPE (type, i),
- looking_for_baseclass);
- if (v)
- return v;
- }
- }
-
- for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
- {
- value_ptr v;
- /* If we are looking for baseclasses, this is what we get when we
- hit them. But it could happen that the base part's member name
- is not yet filled in. */
- int found_baseclass = (looking_for_baseclass
- && TYPE_BASECLASS_NAME (type, i) != NULL
- && STREQ (name, TYPE_BASECLASS_NAME (type, i)));
-
- if (BASETYPE_VIA_VIRTUAL (type, i))
- {
- value_ptr v2;
- /* Fix to use baseclass_offset instead. FIXME */
- baseclass_addr (type, i, VALUE_CONTENTS (arg1) + offset,
- &v2, (int *)NULL);
- if (v2 == 0)
- error ("virtual baseclass botch");
- if (found_baseclass)
- return v2;
- v = search_struct_field (name, v2, 0, TYPE_BASECLASS (type, i),
- looking_for_baseclass);
- }
- else if (found_baseclass)
- v = value_primitive_field (arg1, offset, i, type);
- else
- v = search_struct_field (name, arg1,
- offset + TYPE_BASECLASS_BITPOS (type, i) / 8,
- TYPE_BASECLASS (type, i),
- looking_for_baseclass);
- if (v) return v;
- }
- return NULL;
- }
-
- /* Helper function used by value_struct_elt to recurse through baseclasses.
- Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes,
- and search in it assuming it has (class) type TYPE.
- If found, return value, else if name matched and args not return (value)-1,
- else return NULL. */
-
- static value_ptr
- search_struct_method (name, arg1p, args, offset, static_memfuncp, type)
- char *name;
- register value_ptr *arg1p, *args;
- int offset, *static_memfuncp;
- register struct type *type;
- {
- int i;
- value_ptr v;
- int name_matched = 0;
- char dem_opname[64];
-
- check_stub_type (type);
- for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
- {
- char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
- if (strncmp(t_field_name, "__", 2)==0 ||
- strncmp(t_field_name, "op", 2)==0 ||
- strncmp(t_field_name, "type", 4)==0 )
- {
- if (cplus_demangle_opname(t_field_name, dem_opname, DMGL_ANSI))
- t_field_name = dem_opname;
- else if (cplus_demangle_opname(t_field_name, dem_opname, 0))
- t_field_name = dem_opname;
- }
- if (t_field_name && STREQ (t_field_name, name))
- {
- int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1;
- struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i);
- name_matched = 1;
-
- if (j > 0 && args == 0)
- error ("cannot resolve overloaded method `%s'", name);
- while (j >= 0)
- {
- if (TYPE_FN_FIELD_STUB (f, j))
- check_stub_method (type, i, j);
- if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j),
- TYPE_FN_FIELD_ARGS (f, j), args))
- {
- if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
- return value_virtual_fn_field (arg1p, f, j, type, offset);
- if (TYPE_FN_FIELD_STATIC_P (f, j) && static_memfuncp)
- *static_memfuncp = 1;
- v = value_fn_field (arg1p, f, j, type, offset);
- if (v != NULL) return v;
- }
- j--;
- }
- }
- }
-
- for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
- {
- int base_offset;
-
- if (BASETYPE_VIA_VIRTUAL (type, i))
- {
- base_offset = baseclass_offset (type, i, *arg1p, offset);
- if (base_offset == -1)
- error ("virtual baseclass botch");
- }
- else
- {
- base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8;
- }
- v = search_struct_method (name, arg1p, args, base_offset + offset,
- static_memfuncp, TYPE_BASECLASS (type, i));
- if (v == (value_ptr) -1)
- {
- name_matched = 1;
- }
- else if (v)
- {
- /* FIXME-bothner: Why is this commented out? Why is it here? */
- /* *arg1p = arg1_tmp;*/
- return v;
- }
- }
- if (name_matched) return (value_ptr) -1;
- else return NULL;
- }
-
- /* Given *ARGP, a value of type (pointer to a)* structure/union,
- extract the component named NAME from the ultimate target structure/union
- and return it as a value with its appropriate type.
- ERR is used in the error message if *ARGP's type is wrong.
-
- C++: ARGS is a list of argument types to aid in the selection of
- an appropriate method. Also, handle derived types.
-
- STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location
- where the truthvalue of whether the function that was resolved was
- a static member function or not is stored.
-
- ERR is an error message to be printed in case the field is not found. */
-
- value_ptr
- value_struct_elt (argp, args, name, static_memfuncp, err)
- register value_ptr *argp, *args;
- char *name;
- int *static_memfuncp;
- char *err;
- {
- register struct type *t;
- value_ptr v;
-
- COERCE_ARRAY (*argp);
-
- t = VALUE_TYPE (*argp);
-
- /* Follow pointers until we get to a non-pointer. */
-
- while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
- {
- *argp = value_ind (*argp);
- /* Don't coerce fn pointer to fn and then back again! */
- if (TYPE_CODE (VALUE_TYPE (*argp)) != TYPE_CODE_FUNC)
- COERCE_ARRAY (*argp);
- t = VALUE_TYPE (*argp);
- }
-
- if (TYPE_CODE (t) == TYPE_CODE_MEMBER)
- error ("not implemented: member type in value_struct_elt");
-
- if ( TYPE_CODE (t) != TYPE_CODE_STRUCT
- && TYPE_CODE (t) != TYPE_CODE_UNION)
- error ("Attempt to extract a component of a value that is not a %s.", err);
-
- /* Assume it's not, unless we see that it is. */
- if (static_memfuncp)
- *static_memfuncp =0;
-
- if (!args)
- {
- /* if there are no arguments ...do this... */
-
- /* Try as a field first, because if we succeed, there
- is less work to be done. */
- v = search_struct_field (name, *argp, 0, t, 0);
- if (v)
- return v;
-
- /* C++: If it was not found as a data field, then try to
- return it as a pointer to a method. */
-
- if (destructor_name_p (name, t))
- error ("Cannot get value of destructor");
-
- v = search_struct_method (name, argp, args, 0, static_memfuncp, t);
-
- if (v == (value_ptr) -1)
- error ("Cannot take address of a method");
- else if (v == 0)
- {
- if (TYPE_NFN_FIELDS (t))
- error ("There is no member or method named %s.", name);
- else
- error ("There is no member named %s.", name);
- }
- return v;
- }
-
- if (destructor_name_p (name, t))
- {
- if (!args[1])
- {
- /* destructors are a special case. */
- v = value_fn_field (NULL, TYPE_FN_FIELDLIST1 (t, 0),
- TYPE_FN_FIELDLIST_LENGTH (t, 0), 0, 0);
- if (!v) error("could not find destructor function named %s.", name);
- else return v;
- }
- else
- {
- error ("destructor should not have any argument");
- }
- }
- else
- v = search_struct_method (name, argp, args, 0, static_memfuncp, t);
-
- if (v == (value_ptr) -1)
- {
- error("Argument list of %s mismatch with component in the structure.", name);
- }
- else if (v == 0)
- {
- /* See if user tried to invoke data as function. If so,
- hand it back. If it's not callable (i.e., a pointer to function),
- gdb should give an error. */
- v = search_struct_field (name, *argp, 0, t, 0);
- }
-
- if (!v)
- error ("Structure has no component named %s.", name);
- return v;
- }
-
- /* C++: return 1 is NAME is a legitimate name for the destructor
- of type TYPE. If TYPE does not have a destructor, or
- if NAME is inappropriate for TYPE, an error is signaled. */
- int
- destructor_name_p (name, type)
- const char *name;
- const struct type *type;
- {
- /* destructors are a special case. */
-
- if (name[0] == '~')
- {
- char *dname = type_name_no_tag (type);
- char *cp = strchr (dname, '<');
- int len;
-
- /* Do not compare the template part for template classes. */
- if (cp == NULL)
- len = strlen (dname);
- else
- len = cp - dname;
- if (strlen (name + 1) != len || !STREQN (dname, name + 1, len))
- error ("name of destructor must equal name of class");
- else
- return 1;
- }
- return 0;
- }
-
- /* Helper function for check_field: Given TYPE, a structure/union,
- return 1 if the component named NAME from the ultimate
- target structure/union is defined, otherwise, return 0. */
-
- static int
- check_field_in (type, name)
- register struct type *type;
- const char *name;
- {
- register int i;
-
- for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
- {
- char *t_field_name = TYPE_FIELD_NAME (type, i);
- if (t_field_name && STREQ (t_field_name, name))
- return 1;
- }
-
- /* C++: If it was not found as a data field, then try to
- return it as a pointer to a method. */
-
- /* Destructors are a special case. */
- if (destructor_name_p (name, type))
- return 1;
-
- for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
- {
- if (STREQ (TYPE_FN_FIELDLIST_NAME (type, i), name))
- return 1;
- }
-
- for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
- if (check_field_in (TYPE_BASECLASS (type, i), name))
- return 1;
-
- return 0;
- }
-
-
- /* C++: Given ARG1, a value of type (pointer to a)* structure/union,
- return 1 if the component named NAME from the ultimate
- target structure/union is defined, otherwise, return 0. */
-
- int
- check_field (arg1, name)
- register value_ptr arg1;
- const char *name;
- {
- register struct type *t;
-
- COERCE_ARRAY (arg1);
-
- t = VALUE_TYPE (arg1);
-
- /* Follow pointers until we get to a non-pointer. */
-
- while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
- t = TYPE_TARGET_TYPE (t);
-
- if (TYPE_CODE (t) == TYPE_CODE_MEMBER)
- error ("not implemented: member type in check_field");
-
- if ( TYPE_CODE (t) != TYPE_CODE_STRUCT
- && TYPE_CODE (t) != TYPE_CODE_UNION)
- error ("Internal error: `this' is not an aggregate");
-
- return check_field_in (t, name);
- }
-
- /* C++: Given an aggregate type CURTYPE, and a member name NAME,
- return the address of this member as a "pointer to member"
- type. If INTYPE is non-null, then it will be the type
- of the member we are looking for. This will help us resolve
- "pointers to member functions". This function is used
- to resolve user expressions of the form "DOMAIN::NAME". */
-
- value_ptr
- value_struct_elt_for_reference (domain, offset, curtype, name, intype)
- struct type *domain, *curtype, *intype;
- int offset;
- char *name;
- {
- register struct type *t = curtype;
- register int i;
- value_ptr v;
-
- if ( TYPE_CODE (t) != TYPE_CODE_STRUCT
- && TYPE_CODE (t) != TYPE_CODE_UNION)
- error ("Internal error: non-aggregate type to value_struct_elt_for_reference");
-
- for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--)
- {
- char *t_field_name = TYPE_FIELD_NAME (t, i);
-
- if (t_field_name && STREQ (t_field_name, name))
- {
- if (TYPE_FIELD_STATIC (t, i))
- {
- char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (t, i);
- struct symbol *sym =
- lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL);
- if (sym == NULL)
- error ("Internal error: could not find physical static variable named %s",
- phys_name);
- return value_at (SYMBOL_TYPE (sym),
- (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym));
- }
- if (TYPE_FIELD_PACKED (t, i))
- error ("pointers to bitfield members not allowed");
-
- return value_from_longest
- (lookup_reference_type (lookup_member_type (TYPE_FIELD_TYPE (t, i),
- domain)),
- offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3));
- }
- }
-
- /* C++: If it was not found as a data field, then try to
- return it as a pointer to a method. */
-
- /* Destructors are a special case. */
- if (destructor_name_p (name, t))
- {
- error ("member pointers to destructors not implemented yet");
- }
-
- /* Perform all necessary dereferencing. */
- while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR)
- intype = TYPE_TARGET_TYPE (intype);
-
- for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i)
- {
- char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i);
- char dem_opname[64];
-
- if (strncmp(t_field_name, "__", 2)==0 ||
- strncmp(t_field_name, "op", 2)==0 ||
- strncmp(t_field_name, "type", 4)==0 )
- {
- if (cplus_demangle_opname(t_field_name, dem_opname, DMGL_ANSI))
- t_field_name = dem_opname;
- else if (cplus_demangle_opname(t_field_name, dem_opname, 0))
- t_field_name = dem_opname;
- }
- if (t_field_name && STREQ (t_field_name, name))
- {
- int j = TYPE_FN_FIELDLIST_LENGTH (t, i);
- struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i);
-
- if (intype == 0 && j > 1)
- error ("non-unique member `%s' requires type instantiation", name);
- if (intype)
- {
- while (j--)
- if (TYPE_FN_FIELD_TYPE (f, j) == intype)
- break;
- if (j < 0)
- error ("no member function matches that type instantiation");
- }
- else
- j = 0;
-
- if (TYPE_FN_FIELD_STUB (f, j))
- check_stub_method (t, i, j);
- if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
- {
- return value_from_longest
- (lookup_reference_type
- (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j),
- domain)),
- (LONGEST) METHOD_PTR_FROM_VOFFSET
- (TYPE_FN_FIELD_VOFFSET (f, j)));
- }
- else
- {
- struct symbol *s = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
- 0, VAR_NAMESPACE, 0, NULL);
- if (s == NULL)
- {
- v = 0;
- }
- else
- {
- v = read_var_value (s, 0);
- #if 0
- VALUE_TYPE (v) = lookup_reference_type
- (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j),
- domain));
- #endif
- }
- return v;
- }
- }
- }
- for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--)
- {
- value_ptr v;
- int base_offset;
-
- if (BASETYPE_VIA_VIRTUAL (t, i))
- base_offset = 0;
- else
- base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8;
- v = value_struct_elt_for_reference (domain,
- offset + base_offset,
- TYPE_BASECLASS (t, i),
- name,
- intype);
- if (v)
- return v;
- }
- return 0;
- }
-
- /* C++: return the value of the class instance variable, if one exists.
- Flag COMPLAIN signals an error if the request is made in an
- inappropriate context. */
-
- value_ptr
- value_of_this (complain)
- int complain;
- {
- struct symbol *func, *sym;
- struct block *b;
- int i;
- static const char funny_this[] = "this";
- value_ptr this;
-
- if (selected_frame == 0)
- if (complain)
- error ("no frame selected");
- else return 0;
-
- func = get_frame_function (selected_frame);
- if (!func)
- {
- if (complain)
- error ("no `this' in nameless context");
- else return 0;
- }
-
- b = SYMBOL_BLOCK_VALUE (func);
- i = BLOCK_NSYMS (b);
- if (i <= 0)
- if (complain)
- error ("no args, no `this'");
- else return 0;
-
- /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER
- symbol instead of the LOC_ARG one (if both exist). */
- sym = lookup_block_symbol (b, funny_this, VAR_NAMESPACE);
- if (sym == NULL)
- {
- if (complain)
- error ("current stack frame not in method");
- else
- return NULL;
- }
-
- this = read_var_value (sym, selected_frame);
- if (this == 0 && complain)
- error ("`this' argument at unknown address");
- return this;
- }
-
- /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH elements
- long, starting at LOWBOUND. The result has the same lower bound as
- the original ARRAY. */
-
- value_ptr
- value_slice (array, lowbound, length)
- value_ptr array;
- int lowbound, length;
- {
- if (TYPE_CODE (VALUE_TYPE (array)) == TYPE_CODE_BITSTRING)
- error ("not implemented - bitstring slice");
- if (TYPE_CODE (VALUE_TYPE (array)) != TYPE_CODE_ARRAY
- && TYPE_CODE (VALUE_TYPE (array)) != TYPE_CODE_STRING)
- error ("cannot take slice of non-array");
- else
- {
- struct type *slice_range_type, *slice_type;
- value_ptr slice;
- struct type *range_type = TYPE_FIELD_TYPE (VALUE_TYPE (array), 0);
- struct type *element_type = TYPE_TARGET_TYPE (VALUE_TYPE (array));
- int lowerbound = TYPE_LOW_BOUND (range_type);
- int upperbound = TYPE_HIGH_BOUND (range_type);
- int offset = (lowbound - lowerbound) * TYPE_LENGTH (element_type);
- if (lowbound < lowerbound || length < 0
- || lowbound + length - 1 > upperbound)
- error ("slice out of range");
- slice_range_type = create_range_type ((struct type*) NULL,
- TYPE_TARGET_TYPE (range_type),
- lowerbound,
- lowerbound + length - 1);
- slice_type = create_array_type ((struct type*) NULL, element_type,
- slice_range_type);
- TYPE_CODE (slice_type) = TYPE_CODE (VALUE_TYPE (array));
- slice = allocate_value (slice_type);
- if (VALUE_LAZY (array))
- VALUE_LAZY (slice) = 1;
- else
- memcpy (VALUE_CONTENTS (slice), VALUE_CONTENTS (array) + offset,
- TYPE_LENGTH (slice_type));
- if (VALUE_LVAL (array) == lval_internalvar)
- VALUE_LVAL (slice) = lval_internalvar_component;
- else
- VALUE_LVAL (slice) = VALUE_LVAL (array);
- VALUE_ADDRESS (slice) = VALUE_ADDRESS (array);
- VALUE_OFFSET (slice) = VALUE_OFFSET (array) + offset;
- return slice;
- }
- }
-
- /* Assuming chill_varying_type (VARRAY) is true, return an equivalent
- value as a fixed-length array. */
-
- value_ptr
- varying_to_slice (varray)
- value_ptr varray;
- {
- struct type *vtype = VALUE_TYPE (varray);
- LONGEST length = unpack_long (TYPE_FIELD_TYPE (vtype, 0),
- VALUE_CONTENTS (varray)
- + TYPE_FIELD_BITPOS (vtype, 0) / 8);
- return value_slice (value_primitive_field (varray, 0, 1, vtype), 0, length);
- }
-
- /* Create a value for a FORTRAN complex number. Currently most of
- the time values are coerced to COMPLEX*16 (i.e. a complex number
- composed of 2 doubles. This really should be a smarter routine
- that figures out precision inteligently as opposed to assuming
- doubles. FIXME: fmb */
-
- value_ptr
- value_literal_complex (arg1, arg2, type)
- value_ptr arg1;
- value_ptr arg2;
- struct type *type;
- {
- register value_ptr val;
- struct type *real_type = TYPE_TARGET_TYPE (type);
-
- val = allocate_value (type);
- arg1 = value_cast (real_type, arg1);
- arg2 = value_cast (real_type, arg2);
-
- memcpy (VALUE_CONTENTS_RAW (val),
- VALUE_CONTENTS (arg1), TYPE_LENGTH (real_type));
- memcpy (VALUE_CONTENTS_RAW (val) + TYPE_LENGTH (real_type),
- VALUE_CONTENTS (arg2), TYPE_LENGTH (real_type));
- return val;
- }
-
- /* Cast a value into the appropriate complex data type. */
-
- static value_ptr
- cast_into_complex (type, val)
- struct type *type;
- register value_ptr val;
- {
- struct type *real_type = TYPE_TARGET_TYPE (type);
- if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_COMPLEX)
- {
- struct type *val_real_type = TYPE_TARGET_TYPE (VALUE_TYPE (val));
- value_ptr re_val = allocate_value (val_real_type);
- value_ptr im_val = allocate_value (val_real_type);
-
- memcpy (VALUE_CONTENTS_RAW (re_val),
- VALUE_CONTENTS (val), TYPE_LENGTH (val_real_type));
- memcpy (VALUE_CONTENTS_RAW (im_val),
- VALUE_CONTENTS (val) + TYPE_LENGTH (val_real_type),
- TYPE_LENGTH (val_real_type));
-
- return value_literal_complex (re_val, im_val, type);
- }
- else if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FLT
- || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT)
- return value_literal_complex (val, value_zero (real_type, not_lval), type);
- else
- error ("cannot cast non-number to complex");
- }
-