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binutils-gdb/gdb/valarith.c
Pedro Alves 7022349d5c Stop assuming no-debug-info functions return int 
The fact that GDB defaults to assuming that functions return int, when
it has no debug info for the function has been a recurring source of
user confusion.  Recently this came up on the errno pretty printer
discussions.  Shortly after, it came up again on IRC, with someone
wondering why does getenv() in GDB return a negative int:

  (gdb) p getenv("PATH")
  $1 = -6185

This question (with s/getenv/random-other-C-runtime-function) is a FAQ
on IRC.

The reason for the above is:

 (gdb) p getenv
 $2 = {<text variable, no debug info>} 0x7ffff7751d80 <getenv>
 (gdb) ptype getenv
 type = int ()

... which means that GDB truncated the 64-bit pointer that is actually
returned from getent to 32-bit, and then sign-extended it:

 (gdb) p /x -6185
 $6 = 0xffffe7d7

The workaround is to cast the function to the right type, like:

 (gdb) p ((char *(*) (const char *)) getenv) ("PATH")
 $3 = 0x7fffffffe7d7 "/usr/local/bin:/"...

IMO, we should do better than this.

I see the "assume-int" issue the same way I see printing bogus values
for optimized-out variables instead of "<optimized out>" -- I'd much
rather that the debugger tells me "I don't know" and tells me how to
fix it than showing me bogus misleading results, making me go around
tilting at windmills.

If GDB prints a signed integer when you're expecting a pointer or
aggregate, you at least have some sense that something is off, but
consider the case of the function actually returning a 64-bit integer.
For example, compile this without debug info:

 unsigned long long
 function ()
 {
   return 0x7fffffffffffffff;
 }

Currently, with pristine GDB, you get:

 (gdb) p function ()
 $1 = -1                      # incorrect
 (gdb) p /x function ()
 $2 = 0xffffffff              # incorrect

maybe after spending a few hours debugging you suspect something is
wrong with that -1, and do:

 (gdb) ptype function
 type = int ()

and maybe, just maybe, you realize that the function actually returns
unsigned long long.  And you try to fix it with:

(gdb) p /x (unsigned long long) function ()
 $3 = 0xffffffffffffffff      # incorrect

... which still produces the wrong result, because GDB simply applied
int to unsigned long long conversion.  Meaning, it sign-extended the
integer that it extracted from the return of the function, to 64-bits.

and then maybe, after asking around on IRC, you realize you have to
cast the function to a pointer of the right type, and call that.  It
won't be easy, but after a few missteps, you'll get to it:

.....  (gdb) p /x ((unsigned long long(*) ()) function) ()
 $666 = 0x7fffffffffffffff             # finally! :-)


So to improve on the user experience, this patch does the following
(interrelated) things:

 - makes no-debug-info functions no longer default to "int" as return
   type.  Instead, they're left with NULL/"<unknown return type>"
   return type.

    (gdb) ptype getenv
    type = <unknown return type> ()

 - makes calling a function with unknown return type an error.

    (gdb) p getenv ("PATH")
    'getenv' has unknown return type; cast the call to its declared return type

 - and then to make it easier to call the function, makes it possible
   to _only_ cast the return of the function to the right type,
   instead of having to cast the function to a function pointer:

    (gdb) p (char *) getenv ("PATH")                      # now Just Works
    $3 = 0x7fffffffe7d7 "/usr/local/bin:/"...

    (gdb) p ((char *(*) (const char *)) getenv) ("PATH")  # continues working
    $4 = 0x7fffffffe7d7 "/usr/local/bin:/"...

   I.e., it makes GDB default the function's return type to the type
   of the cast, and the function's parameters to the type of the
   arguments passed down.

After this patch, here's what you'll get for the "unsigned long long"
example above:

 (gdb) p function ()
 'function' has unknown return type; cast the call to its declared return type
 (gdb) p /x (unsigned long long) function ()
 $4 = 0x7fffffffffffffff     # correct!

Note that while with "print" GDB shows the name of the function that
has the problem:

  (gdb) p getenv ("PATH")
  'getenv' has unknown return type; cast the call to its declared return type

which can by handy in more complicated expressions, "ptype" does not:

  (gdb) ptype getenv ("PATH")
  function has unknown return type; cast the call to its declared return type

This will be fixed in the next patch.

gdb/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (ada_evaluate_subexp) <TYPE_CODE_FUNC>: Don't handle
	TYPE_GNU_IFUNC specially here.  Throw error if return type is
	unknown.
	* ada-typeprint.c (print_func_type): Handle functions with unknown
	return type.
	* c-typeprint.c (c_type_print_base): Handle functions and methods
	with unknown return type.
	* compile/compile-c-symbols.c (convert_symbol_bmsym)
	<mst_text_gnu_ifunc>: Use nodebug_text_gnu_ifunc_symbol.
	* compile/compile-c-types.c: Include "objfiles.h".
	(convert_func): For functions with unknown return type, warn and
	default to int.
	* compile/compile-object-run.c (compile_object_run): Adjust call
	to call_function_by_hand_dummy.
	* elfread.c (elf_gnu_ifunc_resolve_addr): Adjust call to
	call_function_by_hand.
	* eval.c (evaluate_subexp_standard): Adjust calls to
	call_function_by_hand.  Handle functions and methods with unknown
	return type.  Pass expect_type to call_function_by_hand.
	* f-typeprint.c (f_type_print_base): Handle functions with unknown
	return type.
	* gcore.c (call_target_sbrk): Adjust call to
	call_function_by_hand.
	* gdbtypes.c (objfile_type): Leave nodebug text symbol with NULL
	return type instead of int.  Make nodebug_text_gnu_ifunc_symbol be
	an integer address type instead of nodebug.
	* guile/scm-value.c (gdbscm_value_call): Adjust call to
	call_function_by_hand.
	* infcall.c (error_call_unknown_return_type): New function.
	(call_function_by_hand): New "default_return_type" parameter.
	Pass it down.
	(call_function_by_hand_dummy): New "default_return_type"
	parameter.  Use it instead of defaulting to int.  If there's no
	default and the return type is unknown, throw an error.  If
	there's a default return type, and the called function has no
	debug info, then assume the function is prototyped.
	* infcall.h (call_function_by_hand, call_function_by_hand_dummy):
	New "default_return_type" parameter.
	(error_call_unknown_return_type): New declaration.
	* linux-fork.c (call_lseek): Cast return type of lseek.
	(inferior_call_waitpid, checkpoint_command): Adjust calls to
	call_function_by_hand.
	* linux-tdep.c (linux_infcall_mmap, linux_infcall_munmap): Adjust
	calls to call_function_by_hand.
	* m2-typeprint.c (m2_procedure): Handle functions with unknown
	return type.
	* objc-lang.c (lookup_objc_class, lookup_child_selector)
	(value_nsstring, print_object_command): Adjust calls to
	call_function_by_hand.
	* p-typeprint.c (pascal_type_print_varspec_prefix): Handle
	functions with unknown return type.
	(pascal_type_print_func_varspec_suffix): New function.
	(pascal_type_print_varspec_suffix) <TYPE_CODE_FUNC,
	TYPE_CODE_METHOD>: Use it.
	* python/py-value.c (valpy_call): Adjust call to
	call_function_by_hand.
	* rust-lang.c (rust_evaluate_funcall): Adjust call to
	call_function_by_hand.
	* valarith.c (value_x_binop, value_x_unop): Adjust calls to
	call_function_by_hand.
	* valops.c (value_allocate_space_in_inferior): Adjust call to
	call_function_by_hand.
	* typeprint.c (type_print_unknown_return_type): New function.
	* typeprint.h (type_print_unknown_return_type): New declaration.

gdb/testsuite/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* gdb.base/break-main-file-remove-fail.exp (test_remove_bp): Cast
	return type of munmap in infcall.
	* gdb.base/break-probes.exp: Cast return type of foo in infcall.
	* gdb.base/checkpoint.exp: Simplify using for loop.  Cast return
	type of ftell in infcall.
	* gdb.base/dprintf-detach.exp (dprintf_detach_test): Cast return
	type of getpid in infcall.
	* gdb.base/infcall-exec.exp: Cast return type of execlp in
	infcall.
	* gdb.base/info-os.exp: Cast return type of getpid in infcall.
	Bail on failure to extract the pid.
	* gdb.base/nodebug.c: #include <stdint.h>.
	(multf, multf_noproto, mult, mult_noproto, add8, add8_noproto):
	New functions.
	* gdb.base/nodebug.exp (test_call_promotion): New procedure.
	Change expected output of print/whatis/ptype with functions with
	no debug info.  Test all supported languages.  Call
	test_call_promotion.
	* gdb.compile/compile.exp: Adjust expected output to expect
	warning.
	* gdb.threads/siginfo-threads.exp: Likewise.
2017-09-04 20:21:13 +01:00

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/* Perform arithmetic and other operations on values, for GDB.
Copyright (C) 1986-2017 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 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/>. */
#include "defs.h"
#include "value.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "target.h"
#include "language.h"
#include "doublest.h"
#include "dfp.h"
#include <math.h>
#include "infcall.h"
/* Define whether or not the C operator '/' truncates towards zero for
differently signed operands (truncation direction is undefined in C). */
#ifndef TRUNCATION_TOWARDS_ZERO
#define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
#endif
void _initialize_valarith (void);
/* 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)
{
LONGEST sz = -1;
struct type *ptr_target;
gdb_assert (TYPE_CODE (ptr_type) == TYPE_CODE_PTR);
ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
sz = type_length_units (ptr_target);
if (sz == 0)
{
if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
sz = 1;
else
{
const char *name;
name = TYPE_NAME (ptr_target);
if (name == NULL)
name = TYPE_TAG_NAME (ptr_target);
if (name == NULL)
error (_("Cannot perform pointer math on incomplete types, "
"try casting to a known type, or void *."));
else
error (_("Cannot perform pointer math on incomplete type \"%s\", "
"try casting to a known type, or void *."), name);
}
}
return sz;
}
/* Given a pointer ARG1 and an integral value ARG2, return the
result of C-style pointer arithmetic ARG1 + ARG2. */
struct value *
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
value_ptrdiff (struct value *arg1, struct value *arg2)
{
struct type *type1, *type2;
LONGEST sz;
arg1 = coerce_array (arg1);
arg2 = coerce_array (arg2);
type1 = check_typedef (value_type (arg1));
type2 = check_typedef (value_type (arg2));
gdb_assert (TYPE_CODE (type1) == TYPE_CODE_PTR);
gdb_assert (TYPE_CODE (type2) == TYPE_CODE_PTR);
if (TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
!= TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
error (_("First argument of `-' is a pointer and "
"second argument is neither\n"
"an integer nor a pointer of the same type."));
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].
ARRAY may be of type TYPE_CODE_ARRAY or TYPE_CODE_STRING. If the
current language supports C-style arrays, it may also be TYPE_CODE_PTR.
See comments in value_coerce_array() for rationale for reason for
doing lower bounds adjustment here rather than there.
FIXME: Perhaps we should validate that the index is valid and if
verbosity is set, warn about invalid indices (but still use them). */
struct value *
value_subscript (struct value *array, LONGEST index)
{
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)
{
struct type *range_type = TYPE_INDEX_TYPE (tarray);
LONGEST lowerbound, upperbound;
get_discrete_bounds (range_type, &lowerbound, &upperbound);
if (VALUE_LVAL (array) != lval_memory)
return value_subscripted_rvalue (array, index, lowerbound);
if (c_style == 0)
{
if (index >= lowerbound && index <= upperbound)
return value_subscripted_rvalue (array, index, lowerbound);
/* Emit warning unless we have an array of unknown size.
An array of unknown size has lowerbound 0 and upperbound -1. */
if (upperbound > -1)
warning (_("array or string index out of range"));
/* fall doing C stuff */
c_style = 1;
}
index -= lowerbound;
array = value_coerce_array (array);
}
if (c_style)
return value_ind (value_ptradd (array, index));
else
error (_("not an array or string"));
}
/* Return the value of EXPR[IDX], expr an aggregate rvalue
(eg, a vector register). This routine used to promote floats
to doubles, but no longer does. */
struct value *
value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
{
struct type *array_type = check_typedef (value_type (array));
struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
ULONGEST elt_size = type_length_units (elt_type);
ULONGEST elt_offs = elt_size * (index - lowerbound);
if (index < lowerbound || (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
&& elt_offs >= type_length_units (array_type)))
{
if (type_not_associated (array_type))
error (_("no such vector element (vector not associated)"));
else if (type_not_allocated (array_type))
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
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,
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
binop or look for a user defined function instead.
For now, we do not overload the `=' operator. */
int
binop_user_defined_p (enum exp_opcode op,
struct value *arg1, struct value *arg2)
{
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 (struct value **args, int nargs, char *oper,
int *static_memfuncp, enum noside noside)
{
struct symbol *symp = NULL;
struct value *valp = NULL;
find_overload_match (args, nargs, 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, struct value **args, char *name,
int *static_memfuncp, int nargs, enum noside noside)
{
struct value *result = NULL;
if (current_language->la_language == language_cplus)
{
result = value_user_defined_cpp_op (args, nargs, name, static_memfuncp,
noside);
}
else
result = value_struct_elt (argp, args, 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 operatore, 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)
{
struct value **argvec;
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 */
argvec = (struct value **) alloca (sizeof (struct value *) * 4);
argvec[1] = value_addr (arg1);
argvec[2] = arg2;
argvec[3] = 0;
/* 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 + 1, tstr,
&static_memfuncp, 2, noside);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
argvec++;
}
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], 2, 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], 2, 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, 2 - static_memfuncp,
argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
#ifdef lint
return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
#endif
}
/* 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));
struct value **argvec;
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 */
argvec = (struct value **) alloca (sizeof (struct value *) * 4);
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);
argvec[3] = 0;
nargs ++;
break;
case UNOP_POSTDECREMENT:
strcpy (ptr, "--");
argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
argvec[3] = 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 + 1, tstr,
&static_memfuncp, nargs, noside);
if (argvec[0])
{
if (static_memfuncp)
{
argvec[1] = argvec[0];
nargs --;
argvec++;
}
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], 1, 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], 1, 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, nargs, argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
return 0; /* For lint -- never reached */
}
/* 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 *ptr;
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 decimal value of arguments for binary operation, converting from
other types if one of them is not decimal floating point. */
static void
value_args_as_decimal (struct value *arg1, struct value *arg2,
gdb_byte *x, int *len_x, enum bfd_endian *byte_order_x,
gdb_byte *y, int *len_y, enum bfd_endian *byte_order_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 decimal float type. */
gdb_assert (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
|| TYPE_CODE (type2) == TYPE_CODE_DECFLOAT);
if (TYPE_CODE (type1) == TYPE_CODE_FLT
|| TYPE_CODE (type2) == TYPE_CODE_FLT)
/* 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 decimal value of arg1, converting from other types
if necessary. */
if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
{
*byte_order_x = gdbarch_byte_order (get_type_arch (type1));
*len_x = TYPE_LENGTH (type1);
memcpy (x, value_contents (arg1), *len_x);
}
else if (is_integral_type (type1))
{
*byte_order_x = gdbarch_byte_order (get_type_arch (type2));
*len_x = TYPE_LENGTH (type2);
decimal_from_integral (arg1, x, *len_x, *byte_order_x);
}
else
error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
TYPE_NAME (type2));
/* Obtain decimal value of arg2, converting from other types
if necessary. */
if (TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
{
*byte_order_y = gdbarch_byte_order (get_type_arch (type2));
*len_y = TYPE_LENGTH (type2);
memcpy (y, value_contents (arg2), *len_y);
}
else if (is_integral_type (type2))
{
*byte_order_y = gdbarch_byte_order (get_type_arch (type1));
*len_y = TYPE_LENGTH (type1);
decimal_from_integral (arg2, y, *len_y, *byte_order_y);
}
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 ((TYPE_CODE (type1) != TYPE_CODE_FLT
&& TYPE_CODE (type1) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type1))
|| (TYPE_CODE (type2) != TYPE_CODE_FLT
&& TYPE_CODE (type2) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type2)))
error (_("Argument to arithmetic operation not a number or boolean."));
if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
|| TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
{
int len_v1, len_v2, len_v;
enum bfd_endian byte_order_v1, byte_order_v2, byte_order_v;
gdb_byte v1[16], v2[16];
gdb_byte v[16];
/* If only one type is decimal float, use its type.
Otherwise use the bigger type. */
if (TYPE_CODE (type1) != TYPE_CODE_DECFLOAT)
result_type = type2;
else if (TYPE_CODE (type2) != TYPE_CODE_DECFLOAT)
result_type = type1;
else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
result_type = type2;
else
result_type = type1;
len_v = TYPE_LENGTH (result_type);
byte_order_v = gdbarch_byte_order (get_type_arch (result_type));
value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
v2, &len_v2, &byte_order_v2);
switch (op)
{
case BINOP_ADD:
case BINOP_SUB:
case BINOP_MUL:
case BINOP_DIV:
case BINOP_EXP:
decimal_binop (op, v1, len_v1, byte_order_v1,
v2, len_v2, byte_order_v2,
v, len_v, byte_order_v);
break;
default:
error (_("Operation not valid for decimal floating point number."));
}
val = value_from_decfloat (result_type, v);
}
else if (TYPE_CODE (type1) == TYPE_CODE_FLT
|| TYPE_CODE (type2) == TYPE_CODE_FLT)
{
/* FIXME-if-picky-about-floating-accuracy: Should be doing this
in target format. real.c in GCC probably has the necessary
code. */
DOUBLEST v1, v2, v = 0;
v1 = value_as_double (arg1);
v2 = value_as_double (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:
v = v1 / v2;
break;
case BINOP_EXP:
errno = 0;
v = pow (v1, v2);
if (errno)
error (_("Cannot perform exponentiation: %s"),
safe_strerror (errno));
break;
case BINOP_MIN:
v = v1 < v2 ? v1 : v2;
break;
case BINOP_MAX:
v = v1 > v2 ? v1 : v2;
break;
default:
error (_("Integer-only operation on floating point number."));
}
/* If only one type is float, use its type.
Otherwise use the bigger type. */
if (TYPE_CODE (type1) != TYPE_CODE_FLT)
result_type = type2;
else if (TYPE_CODE (type2) != TYPE_CODE_FLT)
result_type = type1;
else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
result_type = type2;
else
result_type = type1;
val = allocate_value (result_type);
store_typed_floating (value_contents_raw (val), value_type (val), v);
}
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),
gdbarch_byte_order (get_type_arch (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)),
gdbarch_byte_order
(get_type_arch (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)),
gdbarch_byte_order
(get_type_arch (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 (TYPE_CODE (type1) == TYPE_CODE_FLT)
return 0 == value_as_double (arg1);
else if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
return decimal_is_zero (value_contents (arg1), TYPE_LENGTH (type1),
gdbarch_byte_order (get_type_arch (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 ((code1 == TYPE_CODE_FLT || is_int1)
&& (code2 == TYPE_CODE_FLT || is_int2))
{
/* NOTE: kettenis/20050816: Avoid compiler bug on systems where
`long double' values are returned in static storage (m68k). */
DOUBLEST d = value_as_double (arg1);
return d == value_as_double (arg2);
}
else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
&& (code2 == TYPE_CODE_DECFLOAT || is_int2))
{
gdb_byte v1[16], v2[16];
int len_v1, len_v2;
enum bfd_endian byte_order_v1, byte_order_v2;
value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
v2, &len_v2, &byte_order_v2);
return decimal_compare (v1, len_v1, byte_order_v1,
v2, len_v2, byte_order_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."));
return 0; /* For lint -- never reached. */
}
}
/* 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 ((code1 == TYPE_CODE_FLT || is_int1)
&& (code2 == TYPE_CODE_FLT || is_int2))
{
/* NOTE: kettenis/20050816: Avoid compiler bug on systems where
`long double' values are returned in static storage (m68k). */
DOUBLEST d = value_as_double (arg1);
return d < value_as_double (arg2);
}
else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
&& (code2 == TYPE_CODE_DECFLOAT || is_int2))
{
gdb_byte v1[16], v2[16];
int len_v1, len_v2;
enum bfd_endian byte_order_v1, byte_order_v2;
value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
v2, &len_v2, &byte_order_v2);
return decimal_compare (v1, len_v1, byte_order_v1,
v2, len_v2, byte_order_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 (TYPE_CODE (type) == TYPE_CODE_FLT)
return value_from_double (type, value_as_double (arg1));
else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
return value_from_decfloat (type, value_contents (arg1));
else if (is_integral_type (type))
{
return value_from_longest (type, value_as_long (arg1));
}
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
{
struct value *val = allocate_value (type);
memcpy (value_contents_raw (val), value_contents (arg1),
TYPE_LENGTH (type));
return val;
}
else
{
error (_("Argument to positive operation not a number."));
return 0; /* For lint -- never reached. */
}
}
struct value *
value_neg (struct value *arg1)
{
struct type *type;
arg1 = coerce_ref (arg1);
type = check_typedef (value_type (arg1));
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
{
struct value *val = allocate_value (type);
int len = TYPE_LENGTH (type);
gdb_byte decbytes[16]; /* a decfloat is at most 128 bits long. */
memcpy (decbytes, value_contents (arg1), len);
if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_LITTLE)
decbytes[len-1] = decbytes[len - 1] | 0x80;
else
decbytes[0] = decbytes[0] | 0x80;
memcpy (value_contents_raw (val), decbytes, len);
return val;
}
else if (TYPE_CODE (type) == TYPE_CODE_FLT)
return value_from_double (type, -value_as_double (arg1));
else if (is_integral_type (type))
{
return value_from_longest (type, -value_as_long (arg1));
}
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."));
return 0; /* For lint -- never reached. */
}
}
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,
gdbarch_byte_order (gdbarch));
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;
}
void
_initialize_valarith (void)
{
}
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