mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-24 18:44:20 +08:00
34877895ca
- Rationale:
It is possible for compilers to indicate the desired byte order
interpretation of scalar variables using the DWARF attribute:
DW_AT_endianity
A type flagged with this variable would typically use one of:
DW_END_big
DW_END_little
which instructs the debugger what the desired byte order interpretation
of the variable should be.
The GCC compiler (as of V6) has a mechanism for setting the desired byte
ordering of the fields within a structure or union. For, example, on a
little endian target, a structure declared as:
struct big {
int v;
short a[4];
} __attribute__( ( scalar_storage_order( "big-endian" ) ) );
could be used to ensure all the structure members have a big-endian
interpretation (the compiler would automatically insert byte swap
instructions before and after respective store and load instructions).
- To reproduce
GCC V8 is required to correctly emit DW_AT_endianity DWARF attributes
in all situations when the scalar_storage_order attribute is used.
A fix for (dwarf endianity instrumentation) for GCC V6-V7 can be found
in the URL field of the following PR:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82509
- Test-case:
A new test case (testsuite/gdb.base/endianity.*) is included with this
patch.
Manual testing for mixed endianity code has also been done with GCC V8.
See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82509#c4
- Observed vs. expected:
Without this change, using scalar_storage_order that doesn't match the
target, such as
struct otherendian
{
int v;
} __attribute__( ( scalar_storage_order( "big-endian" ) ) );
would behave like the following on a little endian target:
Breakpoint 1 at 0x401135: file endianity.c, line 41.
(gdb) run
Starting program: /home/pjoot/freeware/t/a.out
Missing separate debuginfos, use: debuginfo-install glibc-2.17-292.el7.x86_64
Breakpoint 1, main () at endianity.c:41
41 struct otherendian o = {3};
(gdb) n
43 do_nothing (&o); /* START */
(gdb) p o
$1 = {v = 50331648}
(gdb) p /x
$2 = {v = 0x3000000}
whereas with this gdb enhancement we can access the variable with the user
specified endianity:
Breakpoint 1, main () at endianity.c:41
41 struct otherendian o = {3};
(gdb) p o
$1 = {v = 0}
(gdb) n
43 do_nothing (&o); /* START */
(gdb) p o
$2 = {v = 3}
(gdb) p o.v = 4
$3 = 4
(gdb) p o.v
$4 = 4
(gdb) x/4xb &o.v
0x7fffffffd90c: 0x00 0x00 0x00 0x04
(observe that the 4 byte int variable has a big endian representation in the
hex dump.)
gdb/ChangeLog
2019-11-21 Peeter Joot <peeter.joot@lzlabs.com>
Byte reverse display of variables with DW_END_big, DW_END_little
(DW_AT_endianity) dwarf attributes if different than the native
byte order.
* ada-lang.c (ada_value_binop):
Use type_byte_order instead of gdbarch_byte_order.
* ada-valprint.c (printstr):
(ada_val_print_string):
* ada-lang.c (value_pointer):
(ada_value_binop):
Use type_byte_order instead of gdbarch_byte_order.
* c-lang.c (c_get_string):
Use type_byte_order instead of gdbarch_byte_order.
* c-valprint.c (c_val_print_array):
Use type_byte_order instead of gdbarch_byte_order.
* cp-valprint.c (cp_print_class_member):
Use type_byte_order instead of gdbarch_byte_order.
* dwarf2loc.c (rw_pieced_value):
Use type_byte_order instead of gdbarch_byte_order.
* dwarf2read.c (read_base_type): Handle DW_END_big,
DW_END_little
* f-lang.c (f_get_encoding):
Use type_byte_order instead of gdbarch_byte_order.
* findvar.c (default_read_var_value):
Use type_byte_order instead of gdbarch_byte_order.
* gdbtypes.c (check_types_equal):
Require matching TYPE_ENDIANITY_NOT_DEFAULT if set.
(recursive_dump_type): Print TYPE_ENDIANITY_BIG,
and TYPE_ENDIANITY_LITTLE if set.
(type_byte_order): new function.
* gdbtypes.h (TYPE_ENDIANITY_NOT_DEFAULT): New macro.
(struct main_type) <flag_endianity_not_default>:
New field.
(type_byte_order): New function.
* infcmd.c (default_print_one_register_info):
Use type_byte_order instead of gdbarch_byte_order.
* p-lang.c (pascal_printstr):
Use type_byte_order instead of gdbarch_byte_order.
* p-valprint.c (pascal_val_print):
Use type_byte_order instead of gdbarch_byte_order.
* printcmd.c (print_scalar_formatted):
Use type_byte_order instead of gdbarch_byte_order.
* solib-darwin.c (darwin_current_sos):
Use type_byte_order instead of gdbarch_byte_order.
* solib-svr4.c (solib_svr4_r_ldsomap):
Use type_byte_order instead of gdbarch_byte_order.
* stap-probe.c (stap_modify_semaphore):
Use type_byte_order instead of gdbarch_byte_order.
* target-float.c (target_float_same_format_p):
Use type_byte_order instead of gdbarch_byte_order.
* valarith.c (scalar_binop):
(value_bit_index):
Use type_byte_order instead of gdbarch_byte_order.
* valops.c (value_cast):
Use type_byte_order instead of gdbarch_byte_order.
* valprint.c (generic_emit_char):
(generic_printstr):
(val_print_string):
Use type_byte_order instead of gdbarch_byte_order.
* value.c (unpack_long):
(unpack_bits_as_long):
(unpack_value_bitfield):
(modify_field):
(pack_long):
(pack_unsigned_long):
Use type_byte_order instead of gdbarch_byte_order.
* findvar.c (unsigned_pointer_to_address):
(signed_pointer_to_address):
(unsigned_address_to_pointer):
(address_to_signed_pointer):
(default_read_var_value):
(default_value_from_register):
Use type_byte_order instead of gdbarch_byte_order.
* gnu-v3-abi.c (gnuv3_make_method_ptr):
Use type_byte_order instead of gdbarch_byte_order.
* riscv-tdep.c (riscv_print_one_register_info):
Use type_byte_order instead of gdbarch_byte_order.
gdb/testsuite/ChangeLog
2019-11-21 Peeter Joot <peeter.joot@lzlabs.com>
* gdb.base/endianity.c: New test.
* gdb.base/endianity.exp: New file.
Change-Id: I4bd98c1b4508c2d7c5a5dbb15d7b7b1cb4e667e2
1742 lines
46 KiB
C
1742 lines
46 KiB
C
/* Perform arithmetic and other operations on values, for GDB.
|
||
|
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Copyright (C) 1986-2019 Free Software Foundation, Inc.
|
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|
||
This file is part of GDB.
|
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|
||
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 3 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, see <http://www.gnu.org/licenses/>. */
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||
|
||
#include "defs.h"
|
||
#include "value.h"
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#include "symtab.h"
|
||
#include "gdbtypes.h"
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||
#include "expression.h"
|
||
#include "target.h"
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||
#include "language.h"
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||
#include "target-float.h"
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#include "infcall.h"
|
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#include "gdbsupport/byte-vector.h"
|
||
#include "gdbarch.h"
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||
|
||
/* Define whether or not the C operator '/' truncates towards zero for
|
||
differently signed operands (truncation direction is undefined in C). */
|
||
|
||
#ifndef TRUNCATION_TOWARDS_ZERO
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||
#define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
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||
#endif
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||
|
||
/* Given a pointer, return the size of its target.
|
||
If the pointer type is void *, then return 1.
|
||
If the target type is incomplete, then error out.
|
||
This isn't a general purpose function, but just a
|
||
helper for value_ptradd. */
|
||
|
||
static LONGEST
|
||
find_size_for_pointer_math (struct type *ptr_type)
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{
|
||
LONGEST sz = -1;
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||
struct type *ptr_target;
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||
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gdb_assert (TYPE_CODE (ptr_type) == TYPE_CODE_PTR);
|
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ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
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||
|
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sz = type_length_units (ptr_target);
|
||
if (sz == 0)
|
||
{
|
||
if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
|
||
sz = 1;
|
||
else
|
||
{
|
||
const char *name;
|
||
|
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name = TYPE_NAME (ptr_target);
|
||
if (name == NULL)
|
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error (_("Cannot perform pointer math on incomplete types, "
|
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"try casting to a known type, or void *."));
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else
|
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error (_("Cannot perform pointer math on incomplete type \"%s\", "
|
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"try casting to a known type, or void *."), name);
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}
|
||
}
|
||
return sz;
|
||
}
|
||
|
||
/* Given a pointer ARG1 and an integral value ARG2, return the
|
||
result of C-style pointer arithmetic ARG1 + ARG2. */
|
||
|
||
struct value *
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||
value_ptradd (struct value *arg1, LONGEST arg2)
|
||
{
|
||
struct type *valptrtype;
|
||
LONGEST sz;
|
||
struct value *result;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
valptrtype = check_typedef (value_type (arg1));
|
||
sz = find_size_for_pointer_math (valptrtype);
|
||
|
||
result = value_from_pointer (valptrtype,
|
||
value_as_address (arg1) + sz * arg2);
|
||
if (VALUE_LVAL (result) != lval_internalvar)
|
||
set_value_component_location (result, arg1);
|
||
return result;
|
||
}
|
||
|
||
/* Given two compatible pointer values ARG1 and ARG2, return the
|
||
result of C-style pointer arithmetic ARG1 - ARG2. */
|
||
|
||
LONGEST
|
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value_ptrdiff (struct value *arg1, struct value *arg2)
|
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{
|
||
struct type *type1, *type2;
|
||
LONGEST sz;
|
||
|
||
arg1 = coerce_array (arg1);
|
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arg2 = coerce_array (arg2);
|
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type1 = check_typedef (value_type (arg1));
|
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type2 = check_typedef (value_type (arg2));
|
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|
||
gdb_assert (TYPE_CODE (type1) == TYPE_CODE_PTR);
|
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gdb_assert (TYPE_CODE (type2) == TYPE_CODE_PTR);
|
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|
||
if (TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
|
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!= TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
|
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error (_("First argument of `-' is a pointer and "
|
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"second argument is neither\n"
|
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"an integer nor a pointer of the same type."));
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|
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sz = type_length_units (check_typedef (TYPE_TARGET_TYPE (type1)));
|
||
if (sz == 0)
|
||
{
|
||
warning (_("Type size unknown, assuming 1. "
|
||
"Try casting to a known type, or void *."));
|
||
sz = 1;
|
||
}
|
||
|
||
return (value_as_long (arg1) - value_as_long (arg2)) / sz;
|
||
}
|
||
|
||
/* Return the value of ARRAY[IDX].
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|
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ARRAY may be of type TYPE_CODE_ARRAY or TYPE_CODE_STRING. If the
|
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current language supports C-style arrays, it may also be TYPE_CODE_PTR.
|
||
|
||
See comments in value_coerce_array() for rationale for reason for
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doing lower bounds adjustment here rather than there.
|
||
FIXME: Perhaps we should validate that the index is valid and if
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verbosity is set, warn about invalid indices (but still use them). */
|
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|
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struct value *
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value_subscript (struct value *array, LONGEST index)
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{
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int c_style = current_language->c_style_arrays;
|
||
struct type *tarray;
|
||
|
||
array = coerce_ref (array);
|
||
tarray = check_typedef (value_type (array));
|
||
|
||
if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
|
||
|| TYPE_CODE (tarray) == TYPE_CODE_STRING)
|
||
{
|
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struct type *range_type = TYPE_INDEX_TYPE (tarray);
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LONGEST lowerbound, upperbound;
|
||
|
||
get_discrete_bounds (range_type, &lowerbound, &upperbound);
|
||
if (VALUE_LVAL (array) != lval_memory)
|
||
return value_subscripted_rvalue (array, index, lowerbound);
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|
||
if (c_style == 0)
|
||
{
|
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if (index >= lowerbound && index <= upperbound)
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return value_subscripted_rvalue (array, index, lowerbound);
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/* Emit warning unless we have an array of unknown size.
|
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An array of unknown size has lowerbound 0 and upperbound -1. */
|
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if (upperbound > -1)
|
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warning (_("array or string index out of range"));
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/* fall doing C stuff */
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c_style = 1;
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||
}
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|
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index -= lowerbound;
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array = value_coerce_array (array);
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||
}
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||
|
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if (c_style)
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return value_ind (value_ptradd (array, index));
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else
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error (_("not an array or string"));
|
||
}
|
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|
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/* Return the value of EXPR[IDX], expr an aggregate rvalue
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(eg, a vector register). This routine used to promote floats
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to doubles, but no longer does. */
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|
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struct value *
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value_subscripted_rvalue (struct value *array, LONGEST index, LONGEST lowerbound)
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||
{
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||
struct type *array_type = check_typedef (value_type (array));
|
||
struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
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ULONGEST elt_size = type_length_units (elt_type);
|
||
ULONGEST elt_offs = elt_size * (index - lowerbound);
|
||
|
||
if (index < lowerbound
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|| (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
|
||
&& elt_offs >= type_length_units (array_type))
|
||
|| (VALUE_LVAL (array) != lval_memory
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||
&& TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)))
|
||
{
|
||
if (type_not_associated (array_type))
|
||
error (_("no such vector element (vector not associated)"));
|
||
else if (type_not_allocated (array_type))
|
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error (_("no such vector element (vector not allocated)"));
|
||
else
|
||
error (_("no such vector element"));
|
||
}
|
||
|
||
if (is_dynamic_type (elt_type))
|
||
{
|
||
CORE_ADDR address;
|
||
|
||
address = value_address (array) + elt_offs;
|
||
elt_type = resolve_dynamic_type (elt_type, NULL, address);
|
||
}
|
||
|
||
return value_from_component (array, elt_type, elt_offs);
|
||
}
|
||
|
||
|
||
/* Check to see if either argument is a structure, or a reference to
|
||
one. This is called so we know whether to go ahead with the normal
|
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binop or look for a user defined function instead.
|
||
|
||
For now, we do not overload the `=' operator. */
|
||
|
||
int
|
||
binop_types_user_defined_p (enum exp_opcode op,
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struct type *type1, struct type *type2)
|
||
{
|
||
if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
|
||
return 0;
|
||
|
||
type1 = check_typedef (type1);
|
||
if (TYPE_IS_REFERENCE (type1))
|
||
type1 = check_typedef (TYPE_TARGET_TYPE (type1));
|
||
|
||
type2 = check_typedef (type2);
|
||
if (TYPE_IS_REFERENCE (type2))
|
||
type2 = check_typedef (TYPE_TARGET_TYPE (type2));
|
||
|
||
return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
|
||
|| TYPE_CODE (type2) == TYPE_CODE_STRUCT);
|
||
}
|
||
|
||
/* Check to see if either argument is a structure, or a reference to
|
||
one. This is called so we know whether to go ahead with the normal
|
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binop or look for a user defined function instead.
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||
|
||
For now, we do not overload the `=' operator. */
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||
|
||
int
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binop_user_defined_p (enum exp_opcode op,
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struct value *arg1, struct value *arg2)
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||
{
|
||
return binop_types_user_defined_p (op, value_type (arg1), value_type (arg2));
|
||
}
|
||
|
||
/* Check to see if argument is a structure. This is called so
|
||
we know whether to go ahead with the normal unop or look for a
|
||
user defined function instead.
|
||
|
||
For now, we do not overload the `&' operator. */
|
||
|
||
int
|
||
unop_user_defined_p (enum exp_opcode op, struct value *arg1)
|
||
{
|
||
struct type *type1;
|
||
|
||
if (op == UNOP_ADDR)
|
||
return 0;
|
||
type1 = check_typedef (value_type (arg1));
|
||
if (TYPE_IS_REFERENCE (type1))
|
||
type1 = check_typedef (TYPE_TARGET_TYPE (type1));
|
||
return TYPE_CODE (type1) == TYPE_CODE_STRUCT;
|
||
}
|
||
|
||
/* Try to find an operator named OPERATOR which takes NARGS arguments
|
||
specified in ARGS. If the operator found is a static member operator
|
||
*STATIC_MEMFUNP will be set to 1, and otherwise 0.
|
||
The search if performed through find_overload_match which will handle
|
||
member operators, non member operators, operators imported implicitly or
|
||
explicitly, and perform correct overload resolution in all of the above
|
||
situations or combinations thereof. */
|
||
|
||
static struct value *
|
||
value_user_defined_cpp_op (gdb::array_view<value *> args, char *oper,
|
||
int *static_memfuncp, enum noside noside)
|
||
{
|
||
|
||
struct symbol *symp = NULL;
|
||
struct value *valp = NULL;
|
||
|
||
find_overload_match (args, oper, BOTH /* could be method */,
|
||
&args[0] /* objp */,
|
||
NULL /* pass NULL symbol since symbol is unknown */,
|
||
&valp, &symp, static_memfuncp, 0, noside);
|
||
|
||
if (valp)
|
||
return valp;
|
||
|
||
if (symp)
|
||
{
|
||
/* This is a non member function and does not
|
||
expect a reference as its first argument
|
||
rather the explicit structure. */
|
||
args[0] = value_ind (args[0]);
|
||
return value_of_variable (symp, 0);
|
||
}
|
||
|
||
error (_("Could not find %s."), oper);
|
||
}
|
||
|
||
/* Lookup user defined operator NAME. Return a value representing the
|
||
function, otherwise return NULL. */
|
||
|
||
static struct value *
|
||
value_user_defined_op (struct value **argp, gdb::array_view<value *> args,
|
||
char *name, int *static_memfuncp, enum noside noside)
|
||
{
|
||
struct value *result = NULL;
|
||
|
||
if (current_language->la_language == language_cplus)
|
||
{
|
||
result = value_user_defined_cpp_op (args, name, static_memfuncp,
|
||
noside);
|
||
}
|
||
else
|
||
result = value_struct_elt (argp, args.data (), name, static_memfuncp,
|
||
"structure");
|
||
|
||
return result;
|
||
}
|
||
|
||
/* We know either arg1 or arg2 is a structure, so try to find the right
|
||
user defined function. Create an argument vector that calls
|
||
arg1.operator @ (arg1,arg2) and return that value (where '@' is any
|
||
binary operator which is legal for GNU C++).
|
||
|
||
OP is the operator, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
|
||
is the opcode saying how to modify it. Otherwise, OTHEROP is
|
||
unused. */
|
||
|
||
struct value *
|
||
value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
|
||
enum exp_opcode otherop, enum noside noside)
|
||
{
|
||
char *ptr;
|
||
char tstr[13];
|
||
int static_memfuncp;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
arg2 = coerce_ref (arg2);
|
||
|
||
/* now we know that what we have to do is construct our
|
||
arg vector and find the right function to call it with. */
|
||
|
||
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
|
||
error (_("Can't do that binary op on that type")); /* FIXME be explicit */
|
||
|
||
value *argvec_storage[3];
|
||
gdb::array_view<value *> argvec = argvec_storage;
|
||
|
||
argvec[1] = value_addr (arg1);
|
||
argvec[2] = arg2;
|
||
|
||
/* Make the right function name up. */
|
||
strcpy (tstr, "operator__");
|
||
ptr = tstr + 8;
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
strcpy (ptr, "+");
|
||
break;
|
||
case BINOP_SUB:
|
||
strcpy (ptr, "-");
|
||
break;
|
||
case BINOP_MUL:
|
||
strcpy (ptr, "*");
|
||
break;
|
||
case BINOP_DIV:
|
||
strcpy (ptr, "/");
|
||
break;
|
||
case BINOP_REM:
|
||
strcpy (ptr, "%");
|
||
break;
|
||
case BINOP_LSH:
|
||
strcpy (ptr, "<<");
|
||
break;
|
||
case BINOP_RSH:
|
||
strcpy (ptr, ">>");
|
||
break;
|
||
case BINOP_BITWISE_AND:
|
||
strcpy (ptr, "&");
|
||
break;
|
||
case BINOP_BITWISE_IOR:
|
||
strcpy (ptr, "|");
|
||
break;
|
||
case BINOP_BITWISE_XOR:
|
||
strcpy (ptr, "^");
|
||
break;
|
||
case BINOP_LOGICAL_AND:
|
||
strcpy (ptr, "&&");
|
||
break;
|
||
case BINOP_LOGICAL_OR:
|
||
strcpy (ptr, "||");
|
||
break;
|
||
case BINOP_MIN:
|
||
strcpy (ptr, "<?");
|
||
break;
|
||
case BINOP_MAX:
|
||
strcpy (ptr, ">?");
|
||
break;
|
||
case BINOP_ASSIGN:
|
||
strcpy (ptr, "=");
|
||
break;
|
||
case BINOP_ASSIGN_MODIFY:
|
||
switch (otherop)
|
||
{
|
||
case BINOP_ADD:
|
||
strcpy (ptr, "+=");
|
||
break;
|
||
case BINOP_SUB:
|
||
strcpy (ptr, "-=");
|
||
break;
|
||
case BINOP_MUL:
|
||
strcpy (ptr, "*=");
|
||
break;
|
||
case BINOP_DIV:
|
||
strcpy (ptr, "/=");
|
||
break;
|
||
case BINOP_REM:
|
||
strcpy (ptr, "%=");
|
||
break;
|
||
case BINOP_BITWISE_AND:
|
||
strcpy (ptr, "&=");
|
||
break;
|
||
case BINOP_BITWISE_IOR:
|
||
strcpy (ptr, "|=");
|
||
break;
|
||
case BINOP_BITWISE_XOR:
|
||
strcpy (ptr, "^=");
|
||
break;
|
||
case BINOP_MOD: /* invalid */
|
||
default:
|
||
error (_("Invalid binary operation specified."));
|
||
}
|
||
break;
|
||
case BINOP_SUBSCRIPT:
|
||
strcpy (ptr, "[]");
|
||
break;
|
||
case BINOP_EQUAL:
|
||
strcpy (ptr, "==");
|
||
break;
|
||
case BINOP_NOTEQUAL:
|
||
strcpy (ptr, "!=");
|
||
break;
|
||
case BINOP_LESS:
|
||
strcpy (ptr, "<");
|
||
break;
|
||
case BINOP_GTR:
|
||
strcpy (ptr, ">");
|
||
break;
|
||
case BINOP_GEQ:
|
||
strcpy (ptr, ">=");
|
||
break;
|
||
case BINOP_LEQ:
|
||
strcpy (ptr, "<=");
|
||
break;
|
||
case BINOP_MOD: /* invalid */
|
||
default:
|
||
error (_("Invalid binary operation specified."));
|
||
}
|
||
|
||
argvec[0] = value_user_defined_op (&arg1, argvec.slice (1), tstr,
|
||
&static_memfuncp, noside);
|
||
|
||
if (argvec[0])
|
||
{
|
||
if (static_memfuncp)
|
||
{
|
||
argvec[1] = argvec[0];
|
||
argvec = argvec.slice (1);
|
||
}
|
||
if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
|
||
{
|
||
/* Static xmethods are not supported yet. */
|
||
gdb_assert (static_memfuncp == 0);
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type
|
||
= result_type_of_xmethod (argvec[0], argvec.slice (1));
|
||
|
||
if (return_type == NULL)
|
||
error (_("Xmethod is missing return type."));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_xmethod (argvec[0], argvec.slice (1));
|
||
}
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type;
|
||
|
||
return_type
|
||
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_function_by_hand (argvec[0], NULL,
|
||
argvec.slice (1, 2 - static_memfuncp));
|
||
}
|
||
throw_error (NOT_FOUND_ERROR,
|
||
_("member function %s not found"), tstr);
|
||
}
|
||
|
||
/* We know that arg1 is a structure, so try to find a unary user
|
||
defined operator that matches the operator in question.
|
||
Create an argument vector that calls arg1.operator @ (arg1)
|
||
and return that value (where '@' is (almost) any unary operator which
|
||
is legal for GNU C++). */
|
||
|
||
struct value *
|
||
value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
|
||
{
|
||
struct gdbarch *gdbarch = get_type_arch (value_type (arg1));
|
||
char *ptr;
|
||
char tstr[13], mangle_tstr[13];
|
||
int static_memfuncp, nargs;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
|
||
/* now we know that what we have to do is construct our
|
||
arg vector and find the right function to call it with. */
|
||
|
||
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
|
||
error (_("Can't do that unary op on that type")); /* FIXME be explicit */
|
||
|
||
value *argvec_storage[3];
|
||
gdb::array_view<value *> argvec = argvec_storage;
|
||
|
||
argvec[1] = value_addr (arg1);
|
||
argvec[2] = 0;
|
||
|
||
nargs = 1;
|
||
|
||
/* Make the right function name up. */
|
||
strcpy (tstr, "operator__");
|
||
ptr = tstr + 8;
|
||
strcpy (mangle_tstr, "__");
|
||
switch (op)
|
||
{
|
||
case UNOP_PREINCREMENT:
|
||
strcpy (ptr, "++");
|
||
break;
|
||
case UNOP_PREDECREMENT:
|
||
strcpy (ptr, "--");
|
||
break;
|
||
case UNOP_POSTINCREMENT:
|
||
strcpy (ptr, "++");
|
||
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
|
||
nargs ++;
|
||
break;
|
||
case UNOP_POSTDECREMENT:
|
||
strcpy (ptr, "--");
|
||
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
|
||
nargs ++;
|
||
break;
|
||
case UNOP_LOGICAL_NOT:
|
||
strcpy (ptr, "!");
|
||
break;
|
||
case UNOP_COMPLEMENT:
|
||
strcpy (ptr, "~");
|
||
break;
|
||
case UNOP_NEG:
|
||
strcpy (ptr, "-");
|
||
break;
|
||
case UNOP_PLUS:
|
||
strcpy (ptr, "+");
|
||
break;
|
||
case UNOP_IND:
|
||
strcpy (ptr, "*");
|
||
break;
|
||
case STRUCTOP_PTR:
|
||
strcpy (ptr, "->");
|
||
break;
|
||
default:
|
||
error (_("Invalid unary operation specified."));
|
||
}
|
||
|
||
argvec[0] = value_user_defined_op (&arg1, argvec.slice (1, nargs), tstr,
|
||
&static_memfuncp, noside);
|
||
|
||
if (argvec[0])
|
||
{
|
||
if (static_memfuncp)
|
||
{
|
||
argvec[1] = argvec[0];
|
||
argvec = argvec.slice (1);
|
||
}
|
||
if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
|
||
{
|
||
/* Static xmethods are not supported yet. */
|
||
gdb_assert (static_memfuncp == 0);
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type
|
||
= result_type_of_xmethod (argvec[0], argvec[1]);
|
||
|
||
if (return_type == NULL)
|
||
error (_("Xmethod is missing return type."));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_xmethod (argvec[0], argvec[1]);
|
||
}
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type;
|
||
|
||
return_type
|
||
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_function_by_hand (argvec[0], NULL,
|
||
argvec.slice (1, nargs));
|
||
}
|
||
throw_error (NOT_FOUND_ERROR,
|
||
_("member function %s not found"), tstr);
|
||
}
|
||
|
||
|
||
/* Concatenate two values with the following conditions:
|
||
|
||
(1) Both values must be either bitstring values or character string
|
||
values and the resulting value consists of the concatenation of
|
||
ARG1 followed by ARG2.
|
||
|
||
or
|
||
|
||
One value must be an integer value and the other value must be
|
||
either a bitstring value or character string value, which is
|
||
to be repeated by the number of times specified by the integer
|
||
value.
|
||
|
||
|
||
(2) Boolean values are also allowed and are treated as bit string
|
||
values of length 1.
|
||
|
||
(3) Character values are also allowed and are treated as character
|
||
string values of length 1. */
|
||
|
||
struct value *
|
||
value_concat (struct value *arg1, struct value *arg2)
|
||
{
|
||
struct value *inval1;
|
||
struct value *inval2;
|
||
struct value *outval = NULL;
|
||
int inval1len, inval2len;
|
||
int count, idx;
|
||
char inchar;
|
||
struct type *type1 = check_typedef (value_type (arg1));
|
||
struct type *type2 = check_typedef (value_type (arg2));
|
||
struct type *char_type;
|
||
|
||
/* First figure out if we are dealing with two values to be concatenated
|
||
or a repeat count and a value to be repeated. INVAL1 is set to the
|
||
first of two concatenated values, or the repeat count. INVAL2 is set
|
||
to the second of the two concatenated values or the value to be
|
||
repeated. */
|
||
|
||
if (TYPE_CODE (type2) == TYPE_CODE_INT)
|
||
{
|
||
struct type *tmp = type1;
|
||
|
||
type1 = tmp;
|
||
tmp = type2;
|
||
inval1 = arg2;
|
||
inval2 = arg1;
|
||
}
|
||
else
|
||
{
|
||
inval1 = arg1;
|
||
inval2 = arg2;
|
||
}
|
||
|
||
/* Now process the input values. */
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_INT)
|
||
{
|
||
/* We have a repeat count. Validate the second value and then
|
||
construct a value repeated that many times. */
|
||
if (TYPE_CODE (type2) == TYPE_CODE_STRING
|
||
|| TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
count = longest_to_int (value_as_long (inval1));
|
||
inval2len = TYPE_LENGTH (type2);
|
||
std::vector<char> ptr (count * inval2len);
|
||
if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
char_type = type2;
|
||
|
||
inchar = (char) unpack_long (type2,
|
||
value_contents (inval2));
|
||
for (idx = 0; idx < count; idx++)
|
||
{
|
||
ptr[idx] = inchar;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
char_type = TYPE_TARGET_TYPE (type2);
|
||
|
||
for (idx = 0; idx < count; idx++)
|
||
{
|
||
memcpy (&ptr[idx * inval2len], value_contents (inval2),
|
||
inval2len);
|
||
}
|
||
}
|
||
outval = value_string (ptr.data (), count * inval2len, char_type);
|
||
}
|
||
else if (TYPE_CODE (type2) == TYPE_CODE_BOOL)
|
||
{
|
||
error (_("unimplemented support for boolean repeats"));
|
||
}
|
||
else
|
||
{
|
||
error (_("can't repeat values of that type"));
|
||
}
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_STRING
|
||
|| TYPE_CODE (type1) == TYPE_CODE_CHAR)
|
||
{
|
||
/* We have two character strings to concatenate. */
|
||
if (TYPE_CODE (type2) != TYPE_CODE_STRING
|
||
&& TYPE_CODE (type2) != TYPE_CODE_CHAR)
|
||
{
|
||
error (_("Strings can only be concatenated with other strings."));
|
||
}
|
||
inval1len = TYPE_LENGTH (type1);
|
||
inval2len = TYPE_LENGTH (type2);
|
||
std::vector<char> ptr (inval1len + inval2len);
|
||
if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
|
||
{
|
||
char_type = type1;
|
||
|
||
ptr[0] = (char) unpack_long (type1, value_contents (inval1));
|
||
}
|
||
else
|
||
{
|
||
char_type = TYPE_TARGET_TYPE (type1);
|
||
|
||
memcpy (ptr.data (), value_contents (inval1), inval1len);
|
||
}
|
||
if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
ptr[inval1len] =
|
||
(char) unpack_long (type2, value_contents (inval2));
|
||
}
|
||
else
|
||
{
|
||
memcpy (&ptr[inval1len], value_contents (inval2), inval2len);
|
||
}
|
||
outval = value_string (ptr.data (), inval1len + inval2len, char_type);
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_BOOL)
|
||
{
|
||
/* We have two bitstrings to concatenate. */
|
||
if (TYPE_CODE (type2) != TYPE_CODE_BOOL)
|
||
{
|
||
error (_("Booleans can only be concatenated "
|
||
"with other bitstrings or booleans."));
|
||
}
|
||
error (_("unimplemented support for boolean concatenation."));
|
||
}
|
||
else
|
||
{
|
||
/* We don't know how to concatenate these operands. */
|
||
error (_("illegal operands for concatenation."));
|
||
}
|
||
return (outval);
|
||
}
|
||
|
||
/* Integer exponentiation: V1**V2, where both arguments are
|
||
integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
|
||
|
||
static LONGEST
|
||
integer_pow (LONGEST v1, LONGEST v2)
|
||
{
|
||
if (v2 < 0)
|
||
{
|
||
if (v1 == 0)
|
||
error (_("Attempt to raise 0 to negative power."));
|
||
else
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
/* The Russian Peasant's Algorithm. */
|
||
LONGEST v;
|
||
|
||
v = 1;
|
||
for (;;)
|
||
{
|
||
if (v2 & 1L)
|
||
v *= v1;
|
||
v2 >>= 1;
|
||
if (v2 == 0)
|
||
return v;
|
||
v1 *= v1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Integer exponentiation: V1**V2, where both arguments are
|
||
integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
|
||
|
||
static ULONGEST
|
||
uinteger_pow (ULONGEST v1, LONGEST v2)
|
||
{
|
||
if (v2 < 0)
|
||
{
|
||
if (v1 == 0)
|
||
error (_("Attempt to raise 0 to negative power."));
|
||
else
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
/* The Russian Peasant's Algorithm. */
|
||
ULONGEST v;
|
||
|
||
v = 1;
|
||
for (;;)
|
||
{
|
||
if (v2 & 1L)
|
||
v *= v1;
|
||
v2 >>= 1;
|
||
if (v2 == 0)
|
||
return v;
|
||
v1 *= v1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Obtain argument values for binary operation, converting from
|
||
other types if one of them is not floating point. */
|
||
static void
|
||
value_args_as_target_float (struct value *arg1, struct value *arg2,
|
||
gdb_byte *x, struct type **eff_type_x,
|
||
gdb_byte *y, struct type **eff_type_y)
|
||
{
|
||
struct type *type1, *type2;
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
|
||
/* At least one of the arguments must be of floating-point type. */
|
||
gdb_assert (is_floating_type (type1) || is_floating_type (type2));
|
||
|
||
if (is_floating_type (type1) && is_floating_type (type2)
|
||
&& TYPE_CODE (type1) != TYPE_CODE (type2))
|
||
/* The DFP extension to the C language does not allow mixing of
|
||
* decimal float types with other float types in expressions
|
||
* (see WDTR 24732, page 12). */
|
||
error (_("Mixing decimal floating types with "
|
||
"other floating types is not allowed."));
|
||
|
||
/* Obtain value of arg1, converting from other types if necessary. */
|
||
|
||
if (is_floating_type (type1))
|
||
{
|
||
*eff_type_x = type1;
|
||
memcpy (x, value_contents (arg1), TYPE_LENGTH (type1));
|
||
}
|
||
else if (is_integral_type (type1))
|
||
{
|
||
*eff_type_x = type2;
|
||
if (TYPE_UNSIGNED (type1))
|
||
target_float_from_ulongest (x, *eff_type_x, value_as_long (arg1));
|
||
else
|
||
target_float_from_longest (x, *eff_type_x, value_as_long (arg1));
|
||
}
|
||
else
|
||
error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
|
||
TYPE_NAME (type2));
|
||
|
||
/* Obtain value of arg2, converting from other types if necessary. */
|
||
|
||
if (is_floating_type (type2))
|
||
{
|
||
*eff_type_y = type2;
|
||
memcpy (y, value_contents (arg2), TYPE_LENGTH (type2));
|
||
}
|
||
else if (is_integral_type (type2))
|
||
{
|
||
*eff_type_y = type1;
|
||
if (TYPE_UNSIGNED (type2))
|
||
target_float_from_ulongest (y, *eff_type_y, value_as_long (arg2));
|
||
else
|
||
target_float_from_longest (y, *eff_type_y, value_as_long (arg2));
|
||
}
|
||
else
|
||
error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
|
||
TYPE_NAME (type2));
|
||
}
|
||
|
||
/* Perform a binary operation on two operands which have reasonable
|
||
representations as integers or floats. This includes booleans,
|
||
characters, integers, or floats.
|
||
Does not support addition and subtraction on pointers;
|
||
use value_ptradd, value_ptrsub or value_ptrdiff for those operations. */
|
||
|
||
static struct value *
|
||
scalar_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
|
||
{
|
||
struct value *val;
|
||
struct type *type1, *type2, *result_type;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
arg2 = coerce_ref (arg2);
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
|
||
if ((!is_floating_value (arg1) && !is_integral_type (type1))
|
||
|| (!is_floating_value (arg2) && !is_integral_type (type2)))
|
||
error (_("Argument to arithmetic operation not a number or boolean."));
|
||
|
||
if (is_floating_type (type1) || is_floating_type (type2))
|
||
{
|
||
/* If only one type is floating-point, use its type.
|
||
Otherwise use the bigger type. */
|
||
if (!is_floating_type (type1))
|
||
result_type = type2;
|
||
else if (!is_floating_type (type2))
|
||
result_type = type1;
|
||
else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
|
||
result_type = type2;
|
||
else
|
||
result_type = type1;
|
||
|
||
val = allocate_value (result_type);
|
||
|
||
struct type *eff_type_v1, *eff_type_v2;
|
||
gdb::byte_vector v1, v2;
|
||
v1.resize (TYPE_LENGTH (result_type));
|
||
v2.resize (TYPE_LENGTH (result_type));
|
||
|
||
value_args_as_target_float (arg1, arg2,
|
||
v1.data (), &eff_type_v1,
|
||
v2.data (), &eff_type_v2);
|
||
target_float_binop (op, v1.data (), eff_type_v1,
|
||
v2.data (), eff_type_v2,
|
||
value_contents_raw (val), result_type);
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
|
||
|| TYPE_CODE (type2) == TYPE_CODE_BOOL)
|
||
{
|
||
LONGEST v1, v2, v = 0;
|
||
|
||
v1 = value_as_long (arg1);
|
||
v2 = value_as_long (arg2);
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_NOTEQUAL:
|
||
v = v1 != v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid operation on booleans."));
|
||
}
|
||
|
||
result_type = type1;
|
||
|
||
val = allocate_value (result_type);
|
||
store_signed_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (result_type),
|
||
type_byte_order (result_type),
|
||
v);
|
||
}
|
||
else
|
||
/* Integral operations here. */
|
||
{
|
||
/* Determine type length of the result, and if the operation should
|
||
be done unsigned. For exponentiation and shift operators,
|
||
use the length and type of the left operand. Otherwise,
|
||
use the signedness of the operand with the greater length.
|
||
If both operands are of equal length, use unsigned operation
|
||
if one of the operands is unsigned. */
|
||
if (op == BINOP_RSH || op == BINOP_LSH || op == BINOP_EXP)
|
||
result_type = type1;
|
||
else if (TYPE_LENGTH (type1) > TYPE_LENGTH (type2))
|
||
result_type = type1;
|
||
else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
|
||
result_type = type2;
|
||
else if (TYPE_UNSIGNED (type1))
|
||
result_type = type1;
|
||
else if (TYPE_UNSIGNED (type2))
|
||
result_type = type2;
|
||
else
|
||
result_type = type1;
|
||
|
||
if (TYPE_UNSIGNED (result_type))
|
||
{
|
||
LONGEST v2_signed = value_as_long (arg2);
|
||
ULONGEST v1, v2, v = 0;
|
||
|
||
v1 = (ULONGEST) value_as_long (arg1);
|
||
v2 = (ULONGEST) v2_signed;
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
v = v1 + v2;
|
||
break;
|
||
|
||
case BINOP_SUB:
|
||
v = v1 - v2;
|
||
break;
|
||
|
||
case BINOP_MUL:
|
||
v = v1 * v2;
|
||
break;
|
||
|
||
case BINOP_DIV:
|
||
case BINOP_INTDIV:
|
||
if (v2 != 0)
|
||
v = v1 / v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_EXP:
|
||
v = uinteger_pow (v1, v2_signed);
|
||
break;
|
||
|
||
case BINOP_REM:
|
||
if (v2 != 0)
|
||
v = v1 % v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_MOD:
|
||
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
|
||
v1 mod 0 has a defined value, v1. */
|
||
if (v2 == 0)
|
||
{
|
||
v = v1;
|
||
}
|
||
else
|
||
{
|
||
v = v1 / v2;
|
||
/* Note floor(v1/v2) == v1/v2 for unsigned. */
|
||
v = v1 - (v2 * v);
|
||
}
|
||
break;
|
||
|
||
case BINOP_LSH:
|
||
v = v1 << v2;
|
||
break;
|
||
|
||
case BINOP_RSH:
|
||
v = v1 >> v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_AND:
|
||
v = v1 && v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_OR:
|
||
v = v1 || v2;
|
||
break;
|
||
|
||
case BINOP_MIN:
|
||
v = v1 < v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_MAX:
|
||
v = v1 > v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_NOTEQUAL:
|
||
v = v1 != v2;
|
||
break;
|
||
|
||
case BINOP_LESS:
|
||
v = v1 < v2;
|
||
break;
|
||
|
||
case BINOP_GTR:
|
||
v = v1 > v2;
|
||
break;
|
||
|
||
case BINOP_LEQ:
|
||
v = v1 <= v2;
|
||
break;
|
||
|
||
case BINOP_GEQ:
|
||
v = v1 >= v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid binary operation on numbers."));
|
||
}
|
||
|
||
val = allocate_value (result_type);
|
||
store_unsigned_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (value_type (val)),
|
||
type_byte_order (result_type),
|
||
v);
|
||
}
|
||
else
|
||
{
|
||
LONGEST v1, v2, v = 0;
|
||
|
||
v1 = value_as_long (arg1);
|
||
v2 = value_as_long (arg2);
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
v = v1 + v2;
|
||
break;
|
||
|
||
case BINOP_SUB:
|
||
v = v1 - v2;
|
||
break;
|
||
|
||
case BINOP_MUL:
|
||
v = v1 * v2;
|
||
break;
|
||
|
||
case BINOP_DIV:
|
||
case BINOP_INTDIV:
|
||
if (v2 != 0)
|
||
v = v1 / v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_EXP:
|
||
v = integer_pow (v1, v2);
|
||
break;
|
||
|
||
case BINOP_REM:
|
||
if (v2 != 0)
|
||
v = v1 % v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_MOD:
|
||
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
|
||
X mod 0 has a defined value, X. */
|
||
if (v2 == 0)
|
||
{
|
||
v = v1;
|
||
}
|
||
else
|
||
{
|
||
v = v1 / v2;
|
||
/* Compute floor. */
|
||
if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
|
||
{
|
||
v--;
|
||
}
|
||
v = v1 - (v2 * v);
|
||
}
|
||
break;
|
||
|
||
case BINOP_LSH:
|
||
v = v1 << v2;
|
||
break;
|
||
|
||
case BINOP_RSH:
|
||
v = v1 >> v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_AND:
|
||
v = v1 && v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_OR:
|
||
v = v1 || v2;
|
||
break;
|
||
|
||
case BINOP_MIN:
|
||
v = v1 < v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_MAX:
|
||
v = v1 > v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_NOTEQUAL:
|
||
v = v1 != v2;
|
||
break;
|
||
|
||
case BINOP_LESS:
|
||
v = v1 < v2;
|
||
break;
|
||
|
||
case BINOP_GTR:
|
||
v = v1 > v2;
|
||
break;
|
||
|
||
case BINOP_LEQ:
|
||
v = v1 <= v2;
|
||
break;
|
||
|
||
case BINOP_GEQ:
|
||
v = v1 >= v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid binary operation on numbers."));
|
||
}
|
||
|
||
val = allocate_value (result_type);
|
||
store_signed_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (value_type (val)),
|
||
type_byte_order (result_type),
|
||
v);
|
||
}
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Widen a scalar value SCALAR_VALUE to vector type VECTOR_TYPE by
|
||
replicating SCALAR_VALUE for each element of the vector. Only scalar
|
||
types that can be cast to the type of one element of the vector are
|
||
acceptable. The newly created vector value is returned upon success,
|
||
otherwise an error is thrown. */
|
||
|
||
struct value *
|
||
value_vector_widen (struct value *scalar_value, struct type *vector_type)
|
||
{
|
||
/* Widen the scalar to a vector. */
|
||
struct type *eltype, *scalar_type;
|
||
struct value *val, *elval;
|
||
LONGEST low_bound, high_bound;
|
||
int i;
|
||
|
||
vector_type = check_typedef (vector_type);
|
||
|
||
gdb_assert (TYPE_CODE (vector_type) == TYPE_CODE_ARRAY
|
||
&& TYPE_VECTOR (vector_type));
|
||
|
||
if (!get_array_bounds (vector_type, &low_bound, &high_bound))
|
||
error (_("Could not determine the vector bounds"));
|
||
|
||
eltype = check_typedef (TYPE_TARGET_TYPE (vector_type));
|
||
elval = value_cast (eltype, scalar_value);
|
||
|
||
scalar_type = check_typedef (value_type (scalar_value));
|
||
|
||
/* If we reduced the length of the scalar then check we didn't loose any
|
||
important bits. */
|
||
if (TYPE_LENGTH (eltype) < TYPE_LENGTH (scalar_type)
|
||
&& !value_equal (elval, scalar_value))
|
||
error (_("conversion of scalar to vector involves truncation"));
|
||
|
||
val = allocate_value (vector_type);
|
||
for (i = 0; i < high_bound - low_bound + 1; i++)
|
||
/* Duplicate the contents of elval into the destination vector. */
|
||
memcpy (value_contents_writeable (val) + (i * TYPE_LENGTH (eltype)),
|
||
value_contents_all (elval), TYPE_LENGTH (eltype));
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Performs a binary operation on two vector operands by calling scalar_binop
|
||
for each pair of vector components. */
|
||
|
||
static struct value *
|
||
vector_binop (struct value *val1, struct value *val2, enum exp_opcode op)
|
||
{
|
||
struct value *val, *tmp, *mark;
|
||
struct type *type1, *type2, *eltype1, *eltype2;
|
||
int t1_is_vec, t2_is_vec, elsize, i;
|
||
LONGEST low_bound1, high_bound1, low_bound2, high_bound2;
|
||
|
||
type1 = check_typedef (value_type (val1));
|
||
type2 = check_typedef (value_type (val2));
|
||
|
||
t1_is_vec = (TYPE_CODE (type1) == TYPE_CODE_ARRAY
|
||
&& TYPE_VECTOR (type1)) ? 1 : 0;
|
||
t2_is_vec = (TYPE_CODE (type2) == TYPE_CODE_ARRAY
|
||
&& TYPE_VECTOR (type2)) ? 1 : 0;
|
||
|
||
if (!t1_is_vec || !t2_is_vec)
|
||
error (_("Vector operations are only supported among vectors"));
|
||
|
||
if (!get_array_bounds (type1, &low_bound1, &high_bound1)
|
||
|| !get_array_bounds (type2, &low_bound2, &high_bound2))
|
||
error (_("Could not determine the vector bounds"));
|
||
|
||
eltype1 = check_typedef (TYPE_TARGET_TYPE (type1));
|
||
eltype2 = check_typedef (TYPE_TARGET_TYPE (type2));
|
||
elsize = TYPE_LENGTH (eltype1);
|
||
|
||
if (TYPE_CODE (eltype1) != TYPE_CODE (eltype2)
|
||
|| elsize != TYPE_LENGTH (eltype2)
|
||
|| TYPE_UNSIGNED (eltype1) != TYPE_UNSIGNED (eltype2)
|
||
|| low_bound1 != low_bound2 || high_bound1 != high_bound2)
|
||
error (_("Cannot perform operation on vectors with different types"));
|
||
|
||
val = allocate_value (type1);
|
||
mark = value_mark ();
|
||
for (i = 0; i < high_bound1 - low_bound1 + 1; i++)
|
||
{
|
||
tmp = value_binop (value_subscript (val1, i),
|
||
value_subscript (val2, i), op);
|
||
memcpy (value_contents_writeable (val) + i * elsize,
|
||
value_contents_all (tmp),
|
||
elsize);
|
||
}
|
||
value_free_to_mark (mark);
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Perform a binary operation on two operands. */
|
||
|
||
struct value *
|
||
value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
|
||
{
|
||
struct value *val;
|
||
struct type *type1 = check_typedef (value_type (arg1));
|
||
struct type *type2 = check_typedef (value_type (arg2));
|
||
int t1_is_vec = (TYPE_CODE (type1) == TYPE_CODE_ARRAY
|
||
&& TYPE_VECTOR (type1));
|
||
int t2_is_vec = (TYPE_CODE (type2) == TYPE_CODE_ARRAY
|
||
&& TYPE_VECTOR (type2));
|
||
|
||
if (!t1_is_vec && !t2_is_vec)
|
||
val = scalar_binop (arg1, arg2, op);
|
||
else if (t1_is_vec && t2_is_vec)
|
||
val = vector_binop (arg1, arg2, op);
|
||
else
|
||
{
|
||
/* Widen the scalar operand to a vector. */
|
||
struct value **v = t1_is_vec ? &arg2 : &arg1;
|
||
struct type *t = t1_is_vec ? type2 : type1;
|
||
|
||
if (TYPE_CODE (t) != TYPE_CODE_FLT
|
||
&& TYPE_CODE (t) != TYPE_CODE_DECFLOAT
|
||
&& !is_integral_type (t))
|
||
error (_("Argument to operation not a number or boolean."));
|
||
|
||
/* Replicate the scalar value to make a vector value. */
|
||
*v = value_vector_widen (*v, t1_is_vec ? type1 : type2);
|
||
|
||
val = vector_binop (arg1, arg2, op);
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
|
||
|
||
int
|
||
value_logical_not (struct value *arg1)
|
||
{
|
||
int len;
|
||
const gdb_byte *p;
|
||
struct type *type1;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
type1 = check_typedef (value_type (arg1));
|
||
|
||
if (is_floating_value (arg1))
|
||
return target_float_is_zero (value_contents (arg1), type1);
|
||
|
||
len = TYPE_LENGTH (type1);
|
||
p = value_contents (arg1);
|
||
|
||
while (--len >= 0)
|
||
{
|
||
if (*p++)
|
||
break;
|
||
}
|
||
|
||
return len < 0;
|
||
}
|
||
|
||
/* Perform a comparison on two string values (whose content are not
|
||
necessarily null terminated) based on their length. */
|
||
|
||
static int
|
||
value_strcmp (struct value *arg1, struct value *arg2)
|
||
{
|
||
int len1 = TYPE_LENGTH (value_type (arg1));
|
||
int len2 = TYPE_LENGTH (value_type (arg2));
|
||
const gdb_byte *s1 = value_contents (arg1);
|
||
const gdb_byte *s2 = value_contents (arg2);
|
||
int i, len = len1 < len2 ? len1 : len2;
|
||
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (s1[i] < s2[i])
|
||
return -1;
|
||
else if (s1[i] > s2[i])
|
||
return 1;
|
||
else
|
||
continue;
|
||
}
|
||
|
||
if (len1 < len2)
|
||
return -1;
|
||
else if (len1 > len2)
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
/* Simulate the C operator == by returning a 1
|
||
iff ARG1 and ARG2 have equal contents. */
|
||
|
||
int
|
||
value_equal (struct value *arg1, struct value *arg2)
|
||
{
|
||
int len;
|
||
const gdb_byte *p1;
|
||
const gdb_byte *p2;
|
||
struct type *type1, *type2;
|
||
enum type_code code1;
|
||
enum type_code code2;
|
||
int is_int1, is_int2;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
arg2 = coerce_array (arg2);
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
code1 = TYPE_CODE (type1);
|
||
code2 = TYPE_CODE (type2);
|
||
is_int1 = is_integral_type (type1);
|
||
is_int2 = is_integral_type (type2);
|
||
|
||
if (is_int1 && is_int2)
|
||
return longest_to_int (value_as_long (value_binop (arg1, arg2,
|
||
BINOP_EQUAL)));
|
||
else if ((is_floating_value (arg1) || is_int1)
|
||
&& (is_floating_value (arg2) || is_int2))
|
||
{
|
||
struct type *eff_type_v1, *eff_type_v2;
|
||
gdb::byte_vector v1, v2;
|
||
v1.resize (std::max (TYPE_LENGTH (type1), TYPE_LENGTH (type2)));
|
||
v2.resize (std::max (TYPE_LENGTH (type1), TYPE_LENGTH (type2)));
|
||
|
||
value_args_as_target_float (arg1, arg2,
|
||
v1.data (), &eff_type_v1,
|
||
v2.data (), &eff_type_v2);
|
||
|
||
return target_float_compare (v1.data (), eff_type_v1,
|
||
v2.data (), eff_type_v2) == 0;
|
||
}
|
||
|
||
/* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
|
||
is bigger. */
|
||
else if (code1 == TYPE_CODE_PTR && is_int2)
|
||
return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
|
||
else if (code2 == TYPE_CODE_PTR && is_int1)
|
||
return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
|
||
|
||
else if (code1 == code2
|
||
&& ((len = (int) TYPE_LENGTH (type1))
|
||
== (int) TYPE_LENGTH (type2)))
|
||
{
|
||
p1 = value_contents (arg1);
|
||
p2 = value_contents (arg2);
|
||
while (--len >= 0)
|
||
{
|
||
if (*p1++ != *p2++)
|
||
break;
|
||
}
|
||
return len < 0;
|
||
}
|
||
else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
|
||
{
|
||
return value_strcmp (arg1, arg2) == 0;
|
||
}
|
||
else
|
||
error (_("Invalid type combination in equality test."));
|
||
}
|
||
|
||
/* Compare values based on their raw contents. Useful for arrays since
|
||
value_equal coerces them to pointers, thus comparing just the address
|
||
of the array instead of its contents. */
|
||
|
||
int
|
||
value_equal_contents (struct value *arg1, struct value *arg2)
|
||
{
|
||
struct type *type1, *type2;
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
|
||
return (TYPE_CODE (type1) == TYPE_CODE (type2)
|
||
&& TYPE_LENGTH (type1) == TYPE_LENGTH (type2)
|
||
&& memcmp (value_contents (arg1), value_contents (arg2),
|
||
TYPE_LENGTH (type1)) == 0);
|
||
}
|
||
|
||
/* Simulate the C operator < by returning 1
|
||
iff ARG1's contents are less than ARG2's. */
|
||
|
||
int
|
||
value_less (struct value *arg1, struct value *arg2)
|
||
{
|
||
enum type_code code1;
|
||
enum type_code code2;
|
||
struct type *type1, *type2;
|
||
int is_int1, is_int2;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
arg2 = coerce_array (arg2);
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
code1 = TYPE_CODE (type1);
|
||
code2 = TYPE_CODE (type2);
|
||
is_int1 = is_integral_type (type1);
|
||
is_int2 = is_integral_type (type2);
|
||
|
||
if (is_int1 && is_int2)
|
||
return longest_to_int (value_as_long (value_binop (arg1, arg2,
|
||
BINOP_LESS)));
|
||
else if ((is_floating_value (arg1) || is_int1)
|
||
&& (is_floating_value (arg2) || is_int2))
|
||
{
|
||
struct type *eff_type_v1, *eff_type_v2;
|
||
gdb::byte_vector v1, v2;
|
||
v1.resize (std::max (TYPE_LENGTH (type1), TYPE_LENGTH (type2)));
|
||
v2.resize (std::max (TYPE_LENGTH (type1), TYPE_LENGTH (type2)));
|
||
|
||
value_args_as_target_float (arg1, arg2,
|
||
v1.data (), &eff_type_v1,
|
||
v2.data (), &eff_type_v2);
|
||
|
||
return target_float_compare (v1.data (), eff_type_v1,
|
||
v2.data (), eff_type_v2) == -1;
|
||
}
|
||
else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
|
||
return value_as_address (arg1) < value_as_address (arg2);
|
||
|
||
/* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
|
||
is bigger. */
|
||
else if (code1 == TYPE_CODE_PTR && is_int2)
|
||
return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
|
||
else if (code2 == TYPE_CODE_PTR && is_int1)
|
||
return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
|
||
else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
|
||
return value_strcmp (arg1, arg2) < 0;
|
||
else
|
||
{
|
||
error (_("Invalid type combination in ordering comparison."));
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* The unary operators +, - and ~. They free the argument ARG1. */
|
||
|
||
struct value *
|
||
value_pos (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (is_integral_type (type) || is_floating_value (arg1)
|
||
|| (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)))
|
||
return value_from_contents (type, value_contents (arg1));
|
||
else
|
||
error (_("Argument to positive operation not a number."));
|
||
}
|
||
|
||
struct value *
|
||
value_neg (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (is_integral_type (type) || is_floating_type (type))
|
||
return value_binop (value_from_longest (type, 0), arg1, BINOP_SUB);
|
||
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
|
||
{
|
||
struct value *tmp, *val = allocate_value (type);
|
||
struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
int i;
|
||
LONGEST low_bound, high_bound;
|
||
|
||
if (!get_array_bounds (type, &low_bound, &high_bound))
|
||
error (_("Could not determine the vector bounds"));
|
||
|
||
for (i = 0; i < high_bound - low_bound + 1; i++)
|
||
{
|
||
tmp = value_neg (value_subscript (arg1, i));
|
||
memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype),
|
||
value_contents_all (tmp), TYPE_LENGTH (eltype));
|
||
}
|
||
return val;
|
||
}
|
||
else
|
||
error (_("Argument to negate operation not a number."));
|
||
}
|
||
|
||
struct value *
|
||
value_complement (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
struct value *val;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (is_integral_type (type))
|
||
val = value_from_longest (type, ~value_as_long (arg1));
|
||
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
|
||
{
|
||
struct value *tmp;
|
||
struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
int i;
|
||
LONGEST low_bound, high_bound;
|
||
|
||
if (!get_array_bounds (type, &low_bound, &high_bound))
|
||
error (_("Could not determine the vector bounds"));
|
||
|
||
val = allocate_value (type);
|
||
for (i = 0; i < high_bound - low_bound + 1; i++)
|
||
{
|
||
tmp = value_complement (value_subscript (arg1, i));
|
||
memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype),
|
||
value_contents_all (tmp), TYPE_LENGTH (eltype));
|
||
}
|
||
}
|
||
else
|
||
error (_("Argument to complement operation not an integer, boolean."));
|
||
|
||
return val;
|
||
}
|
||
|
||
/* The INDEX'th bit of SET value whose value_type is TYPE,
|
||
and whose value_contents is valaddr.
|
||
Return -1 if out of range, -2 other error. */
|
||
|
||
int
|
||
value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
|
||
{
|
||
struct gdbarch *gdbarch = get_type_arch (type);
|
||
LONGEST low_bound, high_bound;
|
||
LONGEST word;
|
||
unsigned rel_index;
|
||
struct type *range = TYPE_INDEX_TYPE (type);
|
||
|
||
if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
|
||
return -2;
|
||
if (index < low_bound || index > high_bound)
|
||
return -1;
|
||
rel_index = index - low_bound;
|
||
word = extract_unsigned_integer (valaddr + (rel_index / TARGET_CHAR_BIT), 1,
|
||
type_byte_order (type));
|
||
rel_index %= TARGET_CHAR_BIT;
|
||
if (gdbarch_bits_big_endian (gdbarch))
|
||
rel_index = TARGET_CHAR_BIT - 1 - rel_index;
|
||
return (word >> rel_index) & 1;
|
||
}
|
||
|
||
int
|
||
value_in (struct value *element, struct value *set)
|
||
{
|
||
int member;
|
||
struct type *settype = check_typedef (value_type (set));
|
||
struct type *eltype = check_typedef (value_type (element));
|
||
|
||
if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
|
||
eltype = TYPE_TARGET_TYPE (eltype);
|
||
if (TYPE_CODE (settype) != TYPE_CODE_SET)
|
||
error (_("Second argument of 'IN' has wrong type"));
|
||
if (TYPE_CODE (eltype) != TYPE_CODE_INT
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_CHAR
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_ENUM
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_BOOL)
|
||
error (_("First argument of 'IN' has wrong type"));
|
||
member = value_bit_index (settype, value_contents (set),
|
||
value_as_long (element));
|
||
if (member < 0)
|
||
error (_("First argument of 'IN' not in range"));
|
||
return member;
|
||
}
|